costumer vs costume

costumer and costume both are nouns.

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

costumer (noun)	costume (noun)
someone who designs or supplies costumes (as for a play or masquerade)	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)

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