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Inspired by this question, I'm interested to know what is the best Attic Greek word for "vocabulary". I thought about θησαυρός, but I'm not sure this is best. I feel like there may also be a word based on γλῶσσα, but there are so many words formed from this root that I wouldn't know where to start. Similarly, I wouldn't be surprised to find a word meaning "vocabulary" based on λόγος.
Thus, I pose the question to you: Which Attic Greek word is best suited to mean "vocabulary"?
Your guesses are very close: Greek terms for "vocabulary" or "glossary" are λέξεις and γλῶσσαι (both nominative plurals).
On λέξις, LSJ says:
Gramm., a word peculiar in form or signification: hence λέξεις is the older term for a glossary, Ῥοδιακαὶ λέξεις a glossary of Rhodian phrases
and on γλῶσσα:
obsolete or foreign word, which needs explanation, Arist. Rh.1410b12, Po.1457b4, Plu.2.406f: hence Γλῶσσαι, title of works by Philemon and others
The lexicon of grammatical terms in Eleanor Dickey's Ancient Greek Scholarship implies something similar, defining γλῶσσα as "dialect, language, obsolete or dialectal word" and λέξις as "word, phrase, speech, diction, style, peculiar word (hence λέξεις 'glossary'), text of an author (as opposed to commentary)". So it seems that of the two, insofar as there was a difference in usage, λέξεις may have been the more general term for "vocabulary", and γλῶσσαι a more specific term for vocabulary consisting of obscure words.
What about "lexicon" as per:
λεξικόν (sc. βιβλίον), = λέξεις (v. λέξις 11.3), AB1094, Phot. tit.
