lexicologist vs linguist

lexicologist and linguist both are nouns.

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

As nouns, linguist is a hypernym of lexicologist; that is, linguist is a word with a broader meaning than lexicologist:

lexicologist: a compiler or writer of a dictionary; a student of the lexical component of language
linguist: a specialist in linguistics

Other hypernyms of lexicologist include compiler, linguistic scientist.

lexicologist (noun)	linguist (noun)
a compiler or writer of a dictionary; a student of the lexical component of language	a person who speaks more than one language
	a specialist in linguistics