antiquarian vs archaist

antiquarian and archaist both are nouns.

Word	Noun	Adjective	Verb	Adverb
antiquarian	Yes	Yes	No	No
archaist	Yes	No	No	No

As nouns, antiquarian and archaist are synonyms defined as:

Other synonyms of antiquarian include antiquary.

antiquarian (noun)	archaist (noun)
an expert or collector of antiquities	an expert or collector of antiquities
	a person who archaizes

antiquarian (adjective)	archaist (adjective)
of or relating to antiques or antiquities
of or relating to persons who study or deal in antiques or antiquities