Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun lexicon

2 senses of lexicon

Sense 1
vocabulary, lexicon, mental lexicon -- (a language user's knowledge of words)
       => cognition, knowledge, noesis -- (the psychological result of perception and learning and reasoning)

Sense 2
dictionary, lexicon -- (a reference book containing an alphabetical list of words with information about them)
       => wordbook -- (a reference book containing words (usually with their meanings))