plug hat vs bowler hat

plug hat and bowler hat both are nouns.

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

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

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

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

plug hat (noun)	bowler 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