What is the vocabulary of a language called?

CyanJaguar62, bound morphemes are word parts that don't exist on their own but are common. "dis-" as in "dislike" but "dis" is not proper word by itself, although many used in slang, like "dis" or "ism" . ie 'philosophy has too many -isms, it is confusing'.

lexicon is also used in specialist fields. Like "legal lexicon" or "medical lexicon ".

You lost me at "bound morphemes". Until then it was a clear explanation.