diff --git a/examples/_shared/defaultItemGroups.js b/examples/_shared/defaultListbox.js
similarity index 93%
rename from examples/_shared/defaultItemGroups.js
rename to examples/_shared/defaultListbox.js
index 990a747..017968c 100644
--- a/examples/_shared/defaultItemGroups.js
+++ b/examples/_shared/defaultListbox.js
@@ -1,4 +1,4 @@
-const defaultItemGroups = [
+const defaultListbox = [
   { name: 'Recent Searches', displayField: 'name', data: [
       { name: 'New Orleans, Louisiana, United States', coords: '29.95465,-90.07507' },
       { name: 'Chicago, Illinois, United States', coords: '41.85003,-87.65005' },
@@ -17,4 +17,4 @@ const defaultItemGroups = [
   }
 ]
 
-export default defaultItemGroups
\ No newline at end of file
+export default defaultListbox
\ No newline at end of file
diff --git a/examples/geo/App.jsx b/examples/geo/App.jsx
index 5ffac55..a145fbc 100644
--- a/examples/geo/App.jsx
+++ b/examples/geo/App.jsx
@@ -2,14 +2,14 @@ import React, { useCallback, useState } from 'react'
 import Turnstone from '../../src/lib'
 import styles from './styles/App.module.css'
 import autocompleteStyles from './styles/autocomplete.module.css'
-import defaultItemGroups from '../_shared/defaultItemGroups'
+import defaultListbox from '../_shared/defaultListbox'
 
 const maxItems = 10
 const placeholder = 'Enter a city or airport'
 const splitChar = ','
 const noItemsMessage = 'We found no places that match your search'
 
-const itemGroups = [
+const listbox = [
   {
     name: 'Cities',
     ratio: 8,
@@ -66,11 +66,11 @@ const App = () => {
             autoFocus={false}
             clearButton={true}
             debounceWait={250}
-            defaultItemGroups={defaultItemGroups}
-            defaultItemGroupsAreImmutable={false}
+            defaultListbox={defaultListbox}
+            defaultListboxIsImmutable={false}
             id='autocomplete'
-            itemGroups={itemGroups}
-            itemGroupsAreImmutable={true}
+            listbox={listbox}
+            listboxIsImmutable={true}
             maxItems={maxItems}
             minQueryLength={1}
             noItemsMessage={noItemsMessage}
diff --git a/src/App.jsx b/src/App.jsx
index aa87652..d60b7df 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -6,6 +6,11 @@ const styles = {
   highlightedItem: 'highlightedItem'
 }
 
+const listbox = {
+  data: fruits,
+  dataSearchType: 'startswith'
+}
+
 const App = () => {
   return (
     <>
@@ -13,10 +18,9 @@ const App = () => {
       <Turnstone
         autoFocus={true}
         clearButton={true}
-        data={fruits}
-        dataSearchType={'startswith'}
         debounceWait={0}
-        itemGroupsAreImmutable={true}
+        listbox={listbox}
+        listboxIsImmutable={true}
         maxItems={10}
         name={'search'}
         noItemsMessage={'No matching fruit found'}
diff --git a/src/lib/__tests__/turnstone.test.jsx b/src/lib/__tests__/turnstone.test.jsx
index eb5b39e..cc2ebdd 100644
--- a/src/lib/__tests__/turnstone.test.jsx
+++ b/src/lib/__tests__/turnstone.test.jsx
@@ -12,8 +12,10 @@ describe('Integration tests', () => {
     const placeholder = 'test'
 
     render(<Turnstone
-      data={fruits}
-      dataSearchType={'startswith'}
+      listbox={{
+        data: fruits,
+        dataSearchType: 'startswith'
+      }}
       placeholder={placeholder}
     />)
 
@@ -31,8 +33,10 @@ describe('Integration tests', () => {
 
     render(<Turnstone
       autoFocus={true}
-      data={fruits}
-      dataSearchType={'startswith'}
+      listbox={{
+        data: fruits,
+        dataSearchType: 'startswith'
+      }}
       text={text}
     />)
 
@@ -46,8 +50,10 @@ describe('Integration tests', () => {
     const text = 'pe'
 
     render(<Turnstone
-      data={fruits}
-      dataSearchType={'startswith'}
+      listbox={{
+        data: fruits,
+        dataSearchType: 'startswith'
+      }}
       text={text}
     />)
 
@@ -58,9 +64,11 @@ describe('Integration tests', () => {
     const placeholder = 'test'
 
     render(<Turnstone
-      data={fruits}
-      dataSearchType={'startswith'}
       disabled={true}
+      listbox={{
+        data: fruits,
+        dataSearchType: 'startswith'
+      }}
       placeholder={placeholder}
     />)
 
@@ -74,8 +82,10 @@ describe('Integration tests', () => {
     const placeholder = 'test'
 
     render(<Turnstone
-      data={fruits}
-      dataSearchType={'startswith'}
+      listbox={{
+        data: fruits,
+        dataSearchType: 'startswith'
+      }}
       placeholder={placeholder}
     />)
 
diff --git a/src/lib/components/container.jsx b/src/lib/components/container.jsx
index 84c224f..a96e6db 100644
--- a/src/lib/components/container.jsx
+++ b/src/lib/components/container.jsx
@@ -29,14 +29,11 @@ export default function Container(props) {
     clearButtonAriaLabel,
     clearButtonText,
     debounceWait,
-    defaultItemGroups,
-    defaultItemGroupsAreImmutable,
+    defaultListbox,
+    defaultListboxIsImmutable,
     disabled,
-    displayField,
-    data,
-    dataSearchType,
     id,
-    itemGroupsAreImmutable,
+    listboxIsImmutable,
     maxItems,
     minQueryLength,
     name,
@@ -49,18 +46,10 @@ export default function Container(props) {
     tabIndex
   } = props
 
-  // Destructure itemGroups prop
-  const {
-    itemGroups = [
-      {
-        name: '',
-        data,
-        dataSearchType,
-        displayField,
-        ratio: maxItems
-      }
-    ]
-  } = props
+  // Destructure listbox prop
+  const listbox = Array.isArray(props.listbox)
+    ? props.listbox
+    : [{ ...props.listbox, ...{ name: '', ratio: maxItems } }]
 
   const listboxId = `${id}-listbox`
 
@@ -78,10 +67,10 @@ export default function Container(props) {
 
   // Checks whether or not SWR data is to be treated as immutable
   const isImmutable = (() => {
-    return itemGroupsAreImmutable &&
+    return listboxIsImmutable &&
       !(
-        defaultItemGroups &&
-        !defaultItemGroupsAreImmutable &&
+        defaultListbox &&
+        !defaultListboxIsImmutable &&
         debouncedQuery.length === 0
       )
   })()
@@ -90,8 +79,8 @@ export default function Container(props) {
   const swrData = useData(
     debouncedQuery.toLowerCase(),
     isImmutable,
-    itemGroups,
-    defaultItemGroups,
+    listbox,
+    defaultListbox,
     minQueryLength,
     maxItems,
     dispatch
diff --git a/src/lib/components/container.test.jsx b/src/lib/components/container.test.jsx
index f54bdcd..ab18e7b 100644
--- a/src/lib/components/container.test.jsx
+++ b/src/lib/components/container.test.jsx
@@ -6,7 +6,7 @@ import { StateContextProvider } from '../context/state'
 import Container from './container'
 import { fruits } from '../../data'
 
-vi.mock('./listbox', () => ({ default: () => 'Items' }))
+vi.mock('./listbox', () => ({ default: () => 'Listbox' }))
 vi.mock('./hooks/containerEffects', () => ({
   useItemsState: vi.fn(),
   useAutoFocus: vi.fn(),
diff --git a/src/lib/components/hooks/useData.js b/src/lib/components/hooks/useData.js
index d5de0b2..5ba204f 100644
--- a/src/lib/components/hooks/useData.js
+++ b/src/lib/components/hooks/useData.js
@@ -75,13 +75,13 @@ const swrOptions = (isImmutable) => {
     : swrBaseOptions
 }
 
-export const fetcher = (query, itemGroups, defaultItemGroups, minQueryLength, maxItems) => {
-  if (defaultItemGroups && query.length > 0 && query.length < minQueryLength)
+export const fetcher = (query, listbox, defaultListbox, minQueryLength, maxItems) => {
+  if (defaultListbox && query.length > 0 && query.length < minQueryLength)
     return []
-  else if (!defaultItemGroups && query.length < minQueryLength) return []
+  else if (!defaultListbox && query.length < minQueryLength) return []
 
   const groupsProp =
-    defaultItemGroups && !query.length ? defaultItemGroups : itemGroups
+    defaultListbox && !query.length ? defaultListbox : listbox
 
   const promises = groupsProp.map((group) => {
     if (typeof group.data === 'function') {
@@ -110,7 +110,7 @@ export const fetcher = (query, itemGroups, defaultItemGroups, minQueryLength, ma
   })
 }
 
-const useData = (query, isImmutable, itemGroups, defaultItemGroups, minQueryLength, maxItems) => {
+const useData = (query, isImmutable, listbox, defaultListbox, minQueryLength, maxItems) => {
 
   // See: https://github.com/vercel/swr/discussions/1810
   const dummyArgToEnsureCachingOfZeroLengthStrings = 'X'
@@ -120,7 +120,7 @@ const useData = (query, isImmutable, itemGroups, defaultItemGroups, minQueryLeng
       query.toLowerCase(),
       dummyArgToEnsureCachingOfZeroLengthStrings
     ],
-    (query) => fetcher(query, itemGroups, defaultItemGroups, minQueryLength, maxItems),
+    (query) => fetcher(query, listbox, defaultListbox, minQueryLength, maxItems),
     swrOptions(isImmutable)
   )
 
diff --git a/src/lib/components/hooks/useData.test.js b/src/lib/components/hooks/useData.test.js
index 5412331..00283c5 100644
--- a/src/lib/components/hooks/useData.test.js
+++ b/src/lib/components/hooks/useData.test.js
@@ -27,7 +27,7 @@ const server = setupServer(
   })
 )
 
-const apiItemGroups = [
+const apiListbox = [
   {
     name: 'Books',
     ratio: 4,
@@ -55,7 +55,7 @@ describe('Fetching API data', () => {
   })
 
   test('Returns expected results', () => {
-    return fetcher('L', apiItemGroups, undef, 1, 6).then(items => {
+    return fetcher('L', apiListbox, undef, 1, 6).then(items => {
       expect(items).toEqual([
         {
           value: { title: 'Last Argument of Kings', author: 'Joe Abercrombie' },
@@ -97,13 +97,13 @@ describe('Fetching API data', () => {
 // // Test Static data                      //
 // ///////////////////////////////////////////
 
-const singleItemGroup = [{
+const singleGroupListbox = [{
   name: '',
   data: fruits,
   dataSearchType: 'startswith'
 }]
 
-const multiItemGroup = [
+const multiGroupListbox = [
   {
     name: 'Fruits',
     data: fruits,
@@ -118,14 +118,14 @@ const multiItemGroup = [
 
 describe('Fetching static data', () => {
   afterEach(() => {
-    delete multiItemGroup[0].ratio
-    delete multiItemGroup[1].ratio
-    multiItemGroup[0].dataSearchType = 'startswith'
-    multiItemGroup[1].dataSearchType = 'startswith'
+    delete multiGroupListbox[0].ratio
+    delete multiGroupListbox[1].ratio
+    multiGroupListbox[0].dataSearchType = 'startswith'
+    multiGroupListbox[1].dataSearchType = 'startswith'
   })
 
   test('Returns expected results for a single group', () => {
-    return fetcher('Pe', singleItemGroup, undef, 1, 10).then(items => {
+    return fetcher('Pe', singleGroupListbox, undef, 1, 10).then(items => {
       expect(items).toEqual([
         { value: 'Peach', text: 'Peach', groupIndex: 0, groupName: '' },
         { value: 'Pear', text: 'Pear', groupIndex: 0, groupName: '' }
@@ -134,7 +134,7 @@ describe('Fetching static data', () => {
   })
 
   test('Returns expected results for multiple groups with equal ratios', () => {
-    return fetcher('P', multiItemGroup, undef, undef, 10).then(items => {
+    return fetcher('P', multiGroupListbox, undef, undef, 10).then(items => {
       expect(items).toEqual([
         { value: 'Peach', text: 'Peach', groupIndex: 0, groupName: 'Fruits' },
         { value: 'Pear', text: 'Pear', groupIndex: 0, groupName: 'Fruits' },
@@ -151,7 +151,7 @@ describe('Fetching static data', () => {
   })
 
   test('Returns expected results for multiple groups limited to 6 results', () => {
-    return fetcher('P', multiItemGroup, undef, 1, 6).then(items => {
+    return fetcher('P', multiGroupListbox, undef, 1, 6).then(items => {
       expect(items).toEqual([
         { value: 'Peach', text: 'Peach', groupIndex: 0, groupName: 'Fruits' },
         { value: 'Pear', text: 'Pear', groupIndex: 0, groupName: 'Fruits' },
@@ -164,10 +164,10 @@ describe('Fetching static data', () => {
   })
 
   test('Returns expected ratios for multiple groups', () => {
-    multiItemGroup[0].ratio = 4
-    multiItemGroup[0].ratio = 2
+    multiGroupListbox[0].ratio = 4
+    multiGroupListbox[0].ratio = 2
 
-    return fetcher('P', multiItemGroup, undef, 1, 6).then(items => {
+    return fetcher('P', multiGroupListbox, undef, 1, 6).then(items => {
       expect(items).toEqual([
         { value: 'Peach', text: 'Peach', groupIndex: 0, groupName: 'Fruits' },
         { value: 'Pear', text: 'Pear', groupIndex: 0, groupName: 'Fruits' },
@@ -180,10 +180,10 @@ describe('Fetching static data', () => {
   })
 
   test('Returns results containing query', () => {
-    multiItemGroup[0].dataSearchType = 'contains'
-    multiItemGroup[1].dataSearchType = 'contains'
+    multiGroupListbox[0].dataSearchType = 'contains'
+    multiGroupListbox[1].dataSearchType = 'contains'
 
-    return fetcher('Pe', multiItemGroup, undef, 1, 6).then(items => {
+    return fetcher('Pe', multiGroupListbox, undef, 1, 6).then(items => {
       expect(items).toEqual([
         { value: 'Bartlett pear', text: 'Bartlett pear', groupIndex: 0, groupName: 'Fruits' },
         { value: 'Cantaloupe', text: 'Cantaloupe', groupIndex: 0, groupName: 'Fruits' },
diff --git a/src/lib/components/listBox.test.jsx b/src/lib/components/listBox.test.jsx
index 66a4dde..7ceb3e8 100644
--- a/src/lib/components/listBox.test.jsx
+++ b/src/lib/components/listBox.test.jsx
@@ -3,7 +3,7 @@ import renderer from 'react-test-renderer'
 
 import { vi, describe, expect, test } from 'vitest'
 import { StateContextProvider } from '../context/state'
-import Listbox from './listBox'
+import Listbox from './listbox'
 
 vi.mock('./item', () => ({ default: () => 'Item' }))
 vi.mock('./item', () => ({ default: () => 'ItemFirst' }))
diff --git a/src/lib/index.jsx b/src/lib/index.jsx
index e807190..d1f3550 100644
--- a/src/lib/index.jsx
+++ b/src/lib/index.jsx
@@ -3,7 +3,6 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import { StateContextProvider } from './context/state'
-import isUndefined from './utils/isUndefined'
 import Container from './components/container'
 
 const randomId = () => `turnstone-${(0|Math.random()*6.04e7).toString(36)}`
@@ -15,10 +14,10 @@ const propDefaults = {
   clearButtonAriaLabel: 'Clear contents',
   clearButtonText: '\u00d7',
   debounceWait: 250,
-  defaultItemGroupsAreImmutable: true,
+  defaultListboxIsImmutable: true,
   disabled: false,
   id: randomId(),
-  itemGroupsAreImmutable: true,
+  listboxIsImmutable: true,
   maxItems: 10,
   minQueryLength: 1,
   placeholder: ''
@@ -38,51 +37,42 @@ export default function Turnstone(props) {
 // Prop validation                                  //
 //////////////////////////////////////////////////////
 
-const msgBothRequired = `Either a "data" prop or an "itemGroups" prop must be provided. Both are missing.`
-const msgOneOnly = `Both a "data" prop and an "itemGroups" prop were provided. Provide one only.`
-const requiredPropsAreMissing = (props) => isUndefined(props.data) && isUndefined(props.itemGroups)
+const dataSearchTypes = ['startswith', 'contains']
+
+const listboxRules = PropTypes.oneOfType([
+  PropTypes.arrayOf(PropTypes.exact({
+    data: PropTypes.oneOfType([
+      PropTypes.func,
+      PropTypes.array
+    ]).isRequired,
+    dataSearchType: PropTypes.oneOf(dataSearchTypes),
+    displayField: PropTypes.string,
+    name: PropTypes.string.isRequired,
+    ratio: PropTypes.number
+  })),
+  PropTypes.exact({
+    data: PropTypes.oneOfType([
+      PropTypes.func,
+      PropTypes.array
+    ]).isRequired,
+    dataSearchType: PropTypes.oneOf(dataSearchTypes),
+    displayField: PropTypes.string
+  })
+])
+
 Turnstone.propTypes = {
   autoFocus: PropTypes.bool,
   clearButton: PropTypes.bool,
   clearButtonAriaLabel: PropTypes.string,
   clearButtonText: PropTypes.string,
-  data: (props) => {
-    if(requiredPropsAreMissing(props)) return new Error(msgBothRequired)
-    if(!isUndefined(props.data) && !isUndefined(props.itemGroups)) return new Error(msgOneOnly)
-    PropTypes.checkPropTypes(
-      {data: PropTypes.oneOfType([PropTypes.array, PropTypes.func])},
-      {data: props.data},
-      'prop', 'Turnstone'
-    )
-  },
-  dataSearchType: PropTypes.oneOf(['startswith', 'contains']),
   debounceWait: PropTypes.number,
-  defaultItemGroups: PropTypes.array,
-  defaultItemGroupsAreImmutable: PropTypes.bool,
+  defaultListbox: listboxRules,
+  defaultListboxIsImmutable: PropTypes.bool,
   disabled: PropTypes.bool,
   displayField: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
   id: PropTypes.string,
-  itemGroups: (props) => {
-    if(requiredPropsAreMissing(props)) return new Error(msgBothRequired)
-    if(!isUndefined(props.data) && !isUndefined(props.itemGroups)) return new Error(msgOneOnly)
-    PropTypes.checkPropTypes(
-      {
-        itemGroups: PropTypes.arrayOf(PropTypes.exact({
-          name: PropTypes.string.isRequired,
-          data: PropTypes.oneOfType([
-            PropTypes.func,
-            PropTypes.array
-          ]).isRequired,
-          dataSearchType: PropTypes.oneOf(['startswith', 'contains']),
-          displayField: PropTypes.string,
-          ratio: PropTypes.number
-        }))
-      },
-      {itemGroups: props.itemGroups},
-      'prop', 'Turnstone'
-    )
-  },
-  itemGroupsAreImmutable: PropTypes.bool,
+  listbox: listboxRules.isRequired,
+  listboxIsImmutable: PropTypes.bool,
   minQueryLength: (props) => {
     PropTypes.checkPropTypes(
       {minQueryLength: PropTypes.number},
diff --git a/src/lib/index.test.jsx b/src/lib/index.test.jsx
index 2a73d69..c14b9e1 100644
--- a/src/lib/index.test.jsx
+++ b/src/lib/index.test.jsx
@@ -35,9 +35,9 @@ describe('Turnstone', () => {
       clearButtonAriaLabel: 'Clear contents',
       clearButtonText: '×',
       debounceWait: 250,
-      defaultItemGroupsAreImmutable: true,
+      defaultListboxIsImmutable: true,
       disabled: false,
-      itemGroupsAreImmutable: true,
+      listboxIsImmutable: true,
       maxItems: 10,
       minQueryLength: 1,
       placeholder: '',
diff --git a/src/lib/reducers/reducer.js b/src/lib/reducers/reducer.js
index 204f73b..62af317 100644
--- a/src/lib/reducers/reducer.js
+++ b/src/lib/reducers/reducer.js
@@ -21,7 +21,7 @@ const reducer = (state, action) => {
           newState.itemsLoaded = false
 
         // Allow listbox if there is no query and we have default items to show
-        if(action.query.length === 0 && state.props.defaultItemGroups)
+        if(action.query.length === 0 && state.props.defaultListbox)
           newState.itemsLoaded = true
 
         return newState
diff --git a/src/lib/reducers/reducer.test.js b/src/lib/reducers/reducer.test.js
index c4e8a90..aa8c95c 100644
--- a/src/lib/reducers/reducer.test.js
+++ b/src/lib/reducers/reducer.test.js
@@ -2,7 +2,7 @@ import { describe, expect, test } from 'vitest'
 import reducer from './reducer'
 import * as actions from '../actions/actions'
 import undef from '../utils/undef'
-import defaultItemGroups from '../../../examples/_shared/defaultItemGroups'
+import defaultListbox from '../../../examples/_shared/defaultListbox'
 
 describe('SET_QUERY action', () => {
   test('produces expected new state', () => {
@@ -69,7 +69,7 @@ describe('SET_QUERY action', () => {
     const state = {
       props: {
         minQueryLength: 1,
-        defaultItemGroups
+        defaultListbox
       }
     }
 
@@ -81,7 +81,7 @@ describe('SET_QUERY action', () => {
       itemsLoaded: true,
       props: {
         minQueryLength: 1,
-        defaultItemGroups
+        defaultListbox
       }
     })
   })