Synonyms of 'vocabulary'
Children need to read to improve their vocabularies.
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A dictionary is a book in which the words and phrases of a language are listed alphabetically, together with their meanings or their translations in another language.
If you don't know what it means, look it up in the dictionary.
The language of a piece of writing or speech is the style in which it is written or spoken.
a booklet summarising it in plain language
Thesaurus for vocabulary from the Collins English Thesaurus
Your vocabulary is the total number of words you know in a particular language.