costume vs attire

costume and attire both are nouns.

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

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

Other hypernyms of costume include dress, garb.

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

Other hypernyms of costume include dress, garb.

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

costume: unusual or period attire not characteristic of or appropriate to the time and place
attire: clothing of a distinctive style or for a particular occasion

Other hypernyms of costume include dress, garb.

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

costume: the prevalent fashion of dress (including accessories and hair style as well as garments)
attire: clothing of a distinctive style or for a particular occasion

Other hypernyms of costume include dress, garb.

costume (noun)	attire (noun)
the attire worn in a play or at a fancy dress ball	clothing of a distinctive style or for a particular occasion
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)	attire (verb)
dress in a costume	put on special clothes to appear particularly appealing and attractive
furnish with costumes; as for a film or play