opera hat vs man's clothing

opera hat and man's clothing both are nouns.

Word	Noun	Adjective	Verb	Adverb
opera hat	Yes	No	No	No
man's clothing	Yes	No	No	No

As nouns, man's clothing is a hypernym of opera hat; that is, man's clothing is a word with a broader meaning than opera hat:

opera hat: a man's hat with a tall crown; usually covered with silk or with beaver fur
man's clothing: clothing that is designed for men to wear

Other hypernyms of opera hat include chapeau, hat, lid.

opera hat (noun)	man's clothing (noun)
a man's hat with a tall crown; usually covered with silk or with beaver fur	clothing that is designed for men to wear