Core Vocabulary vs Nouns-Only AAC: Which Approach Works Better?

If you've spent any time looking at AAC apps or communication boards, you've probably noticed that they're organized in very different ways. Some put high-frequency words like "want," "go," "more," and "not" front and center on the home screen. Others organize everything into categories: food, animals, places, people, actions.

These aren't just aesthetic choices. They represent two fundamentally different philosophies about how communication should be structured. And the research is fairly clear about which one leads to better outcomes.

This post compares core vocabulary systems and noun-based (or category-based) systems, looks at the evidence, and helps you understand what to look for when choosing or setting up an AAC system.

What a Core Vocabulary System Looks Like

In a core-word-based AAC system, the home screen displays the most frequently used words in everyday language. These are small, functional words like:

• Pronouns: I, you, it, my, that
• Verbs: want, go, like, make, get, put, help
• Adjectives/adverbs: more, big, little, good, not, all
• Social words: yes, no, hi, please, sorry, thank you
• Question words: what, where, who, when, why

Nouns are still in the system, but they're accessed through a secondary page or folder. The idea is that the words you need most often should require the fewest button presses.

Well-known AAC systems that use this approach include LAMP (Language Acquisition through Motor Planning), Unity by PRC, PODD (Pragmatic Organisation Dynamic Display), and Proloquo2Go's Crescendo vocabulary. Each implements the concept differently, but they all share the principle that core words deserve prime real estate.

What a Noun-Based System Looks Like

In a noun-based (or category-based) system, the home screen is organized around topics or categories. You might see buttons for:

• Food
• Drinks
• Animals
• People
• Places
• Toys
• Colors
• Body parts

Tapping a category opens a page of nouns within that category. "Food" might show pictures of apple, banana, cookie, pizza, milk, and so on.

Some of these systems include action words or descriptive words, but they're usually buried in their own category or scattered across multiple pages. The structure assumes that most communication is about labeling or requesting specific things.

The Case for Core Vocabulary

The evidence supporting core vocabulary as the primary organizing principle for AAC systems is substantial. Here's what the research tells us.

Core words account for most of what we say

Vocabulary frequency research has consistently demonstrated that a relatively small set of high-frequency words accounts for the vast majority of daily communication across speakers, settings, and situations (Yorkston et al., 1988; Banajee et al., 2003). Baker, Hill, and Devylder (2000) found similar patterns and argued that AAC systems should be designed with these high-frequency words as the foundation.

This isn't just an academic finding. It has direct practical implications. If the vast majority of everything a person says comes from a few hundred high-frequency words, those words should be the easiest to access on any communication system.

Toddlers rely heavily on core words

Banajee, DiCarlo, and Stricklin (2003) studied the vocabulary of young children and found that their most frequently used words were core vocabulary. Words like "that," "more," "no," and "want" vastly outnumbered any individual noun. This suggests that core-word-first systems align more closely with how language naturally develops.

Core words enable sentence construction

This is perhaps the most important argument. With core words, a communicator can form sentences. With only nouns, they can only label.

Consider a child who has access to these core words: "I," "want," "more," "no," "go," "help," "like," "big," "little," "that."

With just those 10 words, they can say:

• "I want that"
• "no more"
• "go help"
• "I like that"
• "want more"
• "no go"
• "help I"
• "big that"

Now consider a child who has 10 nouns: "cookie," "juice," "ball," "car," "dog," "mom," "dad," "book," "shoe," "water."

They can point to any of those 10 things. That's it. They can't combine them in meaningful ways. They can't express that they want something, don't want something, need help, or are finished.

Core words work across all contexts

The word "more" is useful at breakfast, at the park, in the car, at school, and at bedtime. The word "banana" is useful when there's a banana. Core words are context-independent, which means they transfer naturally from one situation to another. Noun-heavy systems require constant customization to match whatever the person is currently doing.

The Limitations of Noun-Only Systems

Noun-based systems aren't useless. Nouns do matter. But when nouns are the primary organizing structure, several problems emerge.

Labeling without communicating

A child who can point to a picture of "juice" is labeling. They're not necessarily communicating. Are they requesting juice? Commenting that there is juice? Telling you they don't want juice? Asking where the juice is? Without core words, the meaning is ambiguous. The communication partner has to guess.

Limited communicative functions

Linguists describe several "communicative functions," which are the purposes behind communication. These include requesting, refusing, commenting, asking questions, greeting, protesting, and directing. A system built primarily around nouns supports requesting (by pointing to desired items) and maybe commenting. It does very little for the other functions.

Core words, by contrast, support all communicative functions:

Vocabulary ceiling

As Beukelman and Mirenda discuss in their foundational AAC textbook, noun-based systems hit a ceiling quickly. You can keep adding nouns, but each noun only adds one more label. The system doesn't grow in communicative power. It just grows in the number of things the person can point to.

Core vocabulary systems scale differently. Each new core word multiplies the possible combinations, which means the system's communicative power grows exponentially rather than linearly.

Constant customization required

If your AAC system is organized around nouns and categories, you need different vocabulary for the kitchen, the classroom, the playground, the doctor's office, and grandma's house. This puts a heavy burden on parents and therapists to constantly update and customize the system.

Core words travel. "Want," "help," "more," "go," and "stop" are useful everywhere. The customization burden is much lower. For more on the fundamental difference between core and fringe vocabulary, see core words vs. fringe words.

Why Most Modern AAC Apps Use Core Vocabulary

Over the past two decades, the AAC field has largely moved toward core vocabulary as the default organizational principle. Most major AAC apps now offer a core-word-first layout as their primary option, even if they also offer category-based alternatives.

This shift happened because clinicians and researchers observed the same pattern repeatedly: children using core-word systems developed more flexible, generative communication than children using noun-based systems. They formed sentences sooner. They communicated across a wider range of situations. And they were better equipped to express needs that didn't map neatly to a specific noun on a board.

That said, the shift hasn't been universal. Some older systems, homemade communication boards, and simpler apps still default to noun-based layouts. If you're evaluating AAC apps, this is an important thing to look for. For a broader guide to the selection process, see choosing the right AAC app.

When Nouns Still Matter

None of this means nouns are unimportant. They absolutely are. Core vocabulary gives a communicator the structure of language. Nouns give them the specificity.

"I want" is useful. "I want pizza" is more useful. "Want go" gets the idea across. "Want go park" is even clearer.

The best AAC systems include both. They just prioritize core words on the home screen and make nouns accessible through organized folders, categories, or search functions. The question isn't "core words or nouns." It's "which words should be easiest to reach?"

The answer, based on the research, is clear: core words first. For a reference list of the most important core words to include, see core words list for AAC.

How to Transition from a Noun-Heavy Setup

If your child is currently using a noun-based system, you don't need to throw everything out and start over. Here's a gradual approach:

1. Add core words to the home screen

Most AAC apps let you customize the home page. Add 5 to 10 high-frequency core words alongside the existing categories. "More," "want," "stop," "go," "help," "no," "yes," "that," "I," and "like" are strong starters.

2. Start modeling the core words

Begin using those core words in your own modeling. When your child points to "cookie," model "want cookie" on the device. When they point to "outside," model "go outside." Layer the core words on top of the nouns they already know.

3. Keep the nouns accessible

Don't remove the nouns. Your child knows where they are and relies on them. Just make sure they're not the only thing on the home screen.

4. Gradually increase core word access

Over time, add more core words and consider switching to a core-word-first layout if your app supports one. Many apps have built-in core vocabulary pages that you can enable.

5. Give it time

Transitions take time. Your child may initially seem less fluent because the layout has changed. That's normal. Within a few weeks, most children adapt and begin to expand their communication as the new core words become familiar.

The Bottom Line

Both core vocabulary and nouns have roles in AAC. But the evidence consistently supports organizing systems with core words as the primary, most accessible vocabulary. Core-word systems allow communicators to form sentences, express a full range of communicative functions, and generalize their vocabulary across contexts.

Noun-based systems let communicators label things. That's valuable, but it's only one small part of communication.

If you're choosing an AAC system, look for one that puts core words front and center. If you're modifying an existing system, start adding core words to the home screen. And if you're modeling for your child, prioritize core words in your own device use.

For the research behind why core words matter so much, see why core words matter in AAC. The science is solid, and the practical benefits are hard to overstate.