stovepipe vs chapeau

stovepipe and chapeau both are nouns.

Word	Noun	Adjective	Verb	Adverb
stovepipe	Yes	No	No	No
chapeau	Yes	No	No	No

As nouns, chapeau is a hypernym of stovepipe; that is, chapeau is a word with a broader meaning than stovepipe:

stovepipe: a man's hat with a tall crown; usually covered with silk or with beaver fur
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of stovepipe include hat, lid, man's clothing.

stovepipe (noun)	chapeau (noun)
chimney consisting of a metal pipe of large diameter that is used to connect a stove to a flue	headdress that protects the head from bad weather; has shaped crown and usually a brim
a man's hat with a tall crown; usually covered with silk or with beaver fur