Lexicon

A lexicon is a dictionary -- a list of words together with additional information. In Linguistics, a lexicon has a slightly more specialized definition, as it includes the Lexemes used to actualize words. Lexemes are formed according to morpho-syntactic rules and express sememes[?].

A lexicon may also be the mental vocabulary in a speaker's mind. Furthermore an indivividual 'lexical knowledge' is a term used in academia to refer to an individual's vocabulary knowledge.