Vocabulary includes all the words a person understands and uses. As their child’s first teachers, parents and families play a key role in helping them build this word knowledge. Understanding vocabulary development during early the childhood and elementary years can help families better support language growth and comprehension skills. In turn, having a strong vocabulary will ultimately benefit a child’s reading skills.
What Is Vocabulary?
Vocabulary is a collection of words that enables us to communicate with each other. Some words children recognize when they hear or read them, while others they actively use when speaking or writing. It’s not uncommon for receptive vocabulary to outpace expressed vocabulary, meaning children often understand more words than they use.
Researchers and educators categorize words into one of three tiers, depending on how the words are used.
Tier 1 – Basic Words
These are everyday words that most children learn naturally through conversation and social interaction. They usually don’t require formal instruction for typically developing learners.
Examples include books, girl, run, sad, and clock
Tier 2 – High-Frequency Words
These are more complex words that help children describe ideas more precisely and can be used in a wide range of situations. These words are essential for reading comprehension and are a priority for explicit teaching in school because they appear across subjects. For example, a child may be asked to compare two books, two sets of numbers, or the results of two science experiments.
Examples include compare, describe, observe, explain, and predict
Tier 3 – Domain-Specific Vocabulary
These are specialized words used in specific subjects. They are less common and usually taught quickly within the context of a lesson.
Examples include atom, peninsula, and photosynthesis
How Vocabulary Develops in Early Childhood
Children begin learning words long before they start school. In fact, they start learning at birth! Vocabulary grows incredibly quickly in the early years. While a typical child may understand about 50 words between the ages of 1 and 2 years old, the number of words grows rapidly.
While every child develops at their own pace, researchers have identified general patterns in how vocabulary expands from toddlerhood through elementary years. See this vocabulary development chart for easy reference. It’s important to keep in mind that vocabulary development varies greatly due to many factors, including exposure to language, socio-economic backgrounds, race, access to materials, and others.
Why Vocabulary Is Essential for Reading Development
Scarborough’s Reading Rope shows us that vocabulary is a key component of language comprehension. Strong readers develop both breadth of vocabulary (how many words they know) and depth of vocabulary (how well they understand those words and the relationship to other words.) Understanding morphology—how words are built from meaningful word parts such prefixes, suffixes, and base words—helps children unlock new vocabulary on their own.
When children know more words, they can understand more of what they read. Once children become independent readers, reading itself becomes one of the fastest ways to learn new vocabulary. Written language often contains words that appear less frequently in everyday conversation, exposing children to richer and more precise language.
Simple Ways to Build Word Knowledge at Home
Families and caregivers do not need special materials or teaching degrees to support vocabulary development. Everyday conversations and interactions are powerful opportunities for word learning. Talking about your daily experiences, asking questions, and playing word games can all help build vocabulary.
Of course, an easy way to build vocabulary is through reading aloud. Reading exposes children (and adults) to words they might not hear in conversation. Selecting the right books and asking questions before, during, and after reading can make story time both fun and educational at every age.
How to Track Vocabulary Growth
Parents often wonder whether their child’s vocabulary is developing as expected. Some signs of healthy vocabulary growth include:
- Your child regularly learns and uses new words
- They can explain what a word means in their own way
- They begin noticing connections between words, like swiftly and quickly
- They encounter new words while reading and ask about them.
You can informally check understanding of vocabulary by asking questions like:
- What do you think that word means?
- Can you use that word in a sentence?
- Which picture shows that word?
Remember that vocabulary grows gradually through conversation, reading, and repeated exposure. A typical kindergarten student already knows around 4,000 words and this number continues to grow rapidly throughout the elementary school years.
Vocabulary is more than just knowing the definition of words. It’s the foundation for reading comprehension, communication, and learning across subjects. By talking, reading, and exploring the world with your child, you are helping them build the word knowledge they need to become confident readers and lifelong learners.
