neologist vs lexicographer

neologist and lexicographer both are nouns.

Word	Noun	Adjective	Verb	Adverb
neologist	Yes	No	No	No
lexicographer	Yes	No	No	No

As nouns, lexicographer is a hypernym of neologist; that is, lexicographer is a word with a broader meaning than neologist:

neologist: a lexicographer of new words and expressions
lexicographer: a compiler or writer of a dictionary; a student of the lexical component of language

Other hypernyms of neologist include lexicologist.

neologist (noun)	lexicographer (noun)
a lexicographer of new words and expressions	a compiler or writer of a dictionary; a student of the lexical component of language