bolero hat vs chapeau

bolero hat and chapeau both are nouns.

Word	Noun	Adjective	Verb	Adverb
bolero hat	Yes	No	No	No
chapeau	Yes	No	No	No

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

bolero hat: A spanish hat with wide, flat brim and flat top, usually made of black felt.
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of bolero hat include hat, lid.

bolero hat (noun)	chapeau (noun)
A spanish hat with wide, flat brim and flat top, usually made of black felt.	headdress that protects the head from bad weather; has shaped crown and usually a brim