antiquary vs antiquarian

antiquary and antiquarian both are nouns.

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

As nouns, antiquary and antiquarian are synonyms defined as:

Other synonyms of antiquary include archaist.

antiquary (noun)	antiquarian (noun)
an expert or collector of antiquities	an expert or collector of antiquities

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