felt hat vs trilby

felt hat and trilby both are nouns.

Word	Noun	Adjective	Verb	Adverb
felt hat	Yes	No	No	No
trilby	Yes	No	No	No

As nouns, felt hat and trilby are synonyms defined as:

Other synonyms of felt hat include fedora, homburg, Stetson.

felt hat (noun)	trilby (noun)
a hat made of felt with a creased crown	a hat made of felt with a creased crown