bowler vs derby hat

bowler and derby hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
bowler	Yes	No	No	No
derby hat	Yes	No	No	No

As nouns, bowler and derby hat are synonyms defined as:

bowler and derby hat: a felt hat that is round and hard with a narrow brim

Other synonyms of bowler include bowler hat, derby, plug hat.

bowler (noun)	derby hat (noun)
a felt hat that is round and hard with a narrow brim	a felt hat that is round and hard with a narrow brim
a player who rolls balls down an alley at pins
a cricketer who delivers the ball to the batsman in cricket