dress hat vs silk hat

dress hat and silk hat both are nouns.

Word	Noun	Adjective	Verb	Adverb
dress hat	Yes	No	No	No
silk hat	Yes	No	No	No

As nouns, dress hat and silk hat are synonyms defined as:

dress hat and silk hat: a man's hat with a tall crown; usually covered with silk or with beaver fur

Other synonyms of dress hat include beaver, high hat, opera hat, stovepipe, top hat, topper.

dress hat (noun)	silk hat (noun)
a man's hat with a tall crown; usually covered with silk or with beaver fur	a man's hat with a tall crown; usually covered with silk or with beaver fur