costume vs furnish

costume is a noun but furnish is not a noun.

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

As verbs, furnish is a hypernym of costume; that is, furnish is a word with a broader meaning than costume:

Other hypernyms of costume include offer, provide, render, supply.

costume (noun)	furnish (noun)
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)

costume (verb)	furnish (verb)
dress in a costume	give something useful or necessary to
furnish with costumes; as for a film or play	provide or equip with furniture