costume vs deck out

costume is a noun but deck out is not a noun.

Word	Noun	Adjective	Verb	Adverb
costume	Yes	No	Yes	No
deck out	No	No	Yes	No

costume (noun)	deck out (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)	deck out (verb)
dress in a costume	put on special clothes to appear particularly appealing and attractive
furnish with costumes; as for a film or play