masquerade vs masquerade costume

masquerade and masquerade costume both are nouns.

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

As nouns, masquerade and masquerade costume are synonyms defined as:

masquerade and masquerade costume: a costume worn as a disguise at a masquerade party

Other synonyms of masquerade include fancy dress.

masquerade (noun)	masquerade costume (noun)
making a false outward show	a costume worn as a disguise at a masquerade party
a costume worn as a disguise at a masquerade party
a party of guests wearing costumes and masks

masquerade (verb)	masquerade costume (verb)
pretend to be someone or something that you are not
take part in a masquerade