How to Improve Vocabulary in Children

Vocabulary is the strongest single predictor of later reading comprehension, and it is built almost entirely by conversation and being read to. Word lists barely move it, for a reason worth understanding.

Why lists do not work

A word learned as a definition sits inert. A child can recite what reluctant means and not recognise it in a sentence, because knowing a word is not one thing: it is knowing roughly what it means, what company it keeps, how strong it is, and when it would be odd to use.

All of that comes from meeting the word repeatedly in different contexts, which is what reading and conversation provide and what a list does not.

Where the words actually come from

Being read to, above their level. The single biggest source. Books contain words conversation does not: even quite simple children's books use rarer vocabulary than ordinary adult speech. This is why read-aloud should continue for years after a child can read alone.

Conversation with adults who do not simplify. Use the real word and then explain it in passing. "He was reluctant, he did not really want to." The child gets the word and the meaning in one sentence without a lesson happening.

Knowing about things. Words come attached to subjects. A child who knows about volcanoes has acquired erupt, molten, dormant without anybody teaching vocabulary. This is why trips, documentaries and obsessions are vocabulary work.

Their own reading, once fluent. Volume matters more than difficulty here.

The habit worth building

Notice interesting words out loud, without turning it into a quiz. "That is a good word. Ferocious." Then use it yourself a few times over the following days.

Repetition in varied contexts is what fixes a word. Three encounters in a week does more than a definition memorised once.

When a child asks what a word means

Answer plainly and briefly, then keep reading. Long explanations kill the reading and teach the child that asking costs them the story, so they stop asking.

Word parts, from about eight

This is where deliberate teaching does pay. Prefixes and roots unlock large numbers of words at once. A child who knows that un reverses, re repeats, and that port has to do with carrying can approach unfamiliar words with a strategy rather than a shrug.

It is also the one part of vocabulary that generalises, which is why it is worth the small amount of explicit attention.

What to avoid

Testing. Simplifying your own speech. Correcting a wrong usage sharply, which teaches a child to use only words they are certain of and therefore to stop growing. A child who says hilarious slightly wrong is doing exactly the right thing.

The children with the largest vocabularies are not the ones taught the most words. They are the ones read to the most and talked with the most, about things that were interesting.