derby hat vs plug hat

derby hat and plug hat both are nouns.

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

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

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

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

derby hat (noun)	plug 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