Breadth, Depth, and Why SLPs Care About the Second
Breadth is how many words a child has met. Depth is how much they know about each one: what it means, what it is related to, what it is the opposite of, which other meanings it carries, and which situations it fits. A vocabulary intervention that only adds new words is doing the easier half.
The clinical technique that makes this visible is semantic feature analysis — taking a word and building out what it is, what it does, what it is made of, where you find it, and what it goes with. Doing that with ten words usually helps a child more than being introduced to fifty, because it builds the connections that let a word be retrieved when needed.
Word-finding difficulty is the symptom on the other side of the same coin. A child who circles a word, says "the thing you cut with", or produces a related word instead of the target often knows the word perfectly well — the network around it is too thin to retrieve it quickly. That is why speed matters in practice and why a timed game is not just a gimmick here.
The Word Categories Therapy Actually Uses
Most vocabulary goals sit in a handful of categories. Synonyms and antonyms build the relational web around a word. Categorisation and describing build the features under it. Multiple-meaning words matter enormously because English is full of them and because a child who has locked one meaning in will mis-read a whole sentence around the other. Figurative language — idioms, similes, metaphors — is the last to arrive and the most often missed.
Figurative language deserves a note on timing. Understanding of common idioms builds through the elementary years and is still developing well into adolescence, and it lands right where textbooks and teachers stop explaining themselves. A student who takes "break the ice" literally is not being difficult; they have a specific, teachable gap.
The other useful frame is word tiers. Tier 1 is everyday conversation, tier 3 is technical subject vocabulary, and tier 2 is the band in between — "reluctant", "observe", "consequence" — that appears across every subject, rarely gets taught directly, and does most of the damage when it is missing. Tier 2 is where a vocabulary goal usually belongs.
Making Words Stick
A word generally needs many meaningful encounters before it is genuinely owned — the figure usually quoted is around a dozen, and they have to be varied rather than twelve repetitions of the same sentence. Reading a definition once does almost nothing; meeting the word in a game, in a book, in a conversation, and then having to produce it, does a great deal.
Retrieval beats recognition. Asking a child to come up with an opposite is harder, and more useful, than asking them to pick one from four options — so use the game for volume and speed, then close the session by asking for a few words with no options on screen. That two-step is the cheapest upgrade available to any vocabulary practice.
Tie the words to something being read. Practising vocabulary from a text a student actually has to get through gets more engagement than a generic list, and it generalises better for the same reason: the words come back the next day in a context that needs them.