stovepipe vs opera hat

stovepipe and opera hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
stovepipe	Yes	No	No	No
opera hat	Yes	No	No	No

As nouns, stovepipe and opera hat are synonyms defined as:

stovepipe and opera hat: a man's hat with a tall crown; usually covered with silk or with beaver fur

Other synonyms of stovepipe include beaver, dress hat, high hat, silk hat, top hat, topper.

stovepipe (noun)	opera hat (noun)
chimney consisting of a metal pipe of large diameter that is used to connect a stove to a flue	a man's hat with a tall crown; usually covered with silk or with beaver fur
a man's hat with a tall crown; usually covered with silk or with beaver fur