lexicographer vs lexicologist

lexicographer and lexicologist both are nouns.

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

As nouns, lexicographer and lexicologist are synonyms defined as:

lexicographer and lexicologist: a compiler or writer of a dictionary; a student of the lexical component of language

lexicographer (noun)	lexicologist (noun)
a compiler or writer of a dictionary; a student of the lexical component of language	a compiler or writer of a dictionary; a student of the lexical component of language