Crossword Genius

Lexicon (10)

Ross

I think it could be either:

dictionary

vocabulary

'lexicon' is the definition.
(synonyms)

This is all the clue.

(Other definitions for vocabulary that I've seen before include "Word list" , "Knowledge of words" , "Range of words" , "List of words" , "Words an individual knows" .)

I've seen this clue in the Sydney Morning Herald.
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