bowler vs chapeau

bowler and chapeau both are nouns.

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

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

bowler: 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 bowler include hat, lid.

bowler (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
a player who rolls balls down an alley at pins
a cricketer who delivers the ball to the batsman in cricket