cocked hat vs chapeau

cocked hat and chapeau both are nouns.

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

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

cocked hat: hat with opposing brims turned up and caught together to form points
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of cocked hat include hat, lid.

cocked hat (noun)	chapeau (noun)
hat with opposing brims turned up and caught together to form points	headdress that protects the head from bad weather; has shaped crown and usually a brim