fursuit vs costume

fursuit and costume both are nouns.

Word	Noun	Adjective	Verb	Adverb
fursuit	Yes	No	No	No
costume	Yes	No	Yes	No

As nouns, costume is a hypernym of fursuit; that is, costume is a word with a broader meaning than fursuit:

fursuit (noun)	costume (noun)
A full body animal suit	the attire worn in a play or at a fancy dress ball
	the attire characteristic of a country or a time or a social class
	unusual or period attire not characteristic of or appropriate to the time and place
	the prevalent fashion of dress (including accessories and hair style as well as garments)

fursuit (verb)	costume (verb)
	dress in a costume
	furnish with costumes; as for a film or play