derby vs chapeau

derby and chapeau both are nouns.

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

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

derby: a felt hat that is round and hard with a narrow brim
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of derby include hat, lid.

derby (noun)	chapeau (noun)
a felt hat that is round and hard with a narrow brim	headdress that protects the head from bad weather; has shaped crown and usually a brim