derby hat vs derby

derby hat and derby both are nouns.

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

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

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

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

derby hat (noun)	derby (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