felt hat vs hat

felt hat and hat both are nouns.

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

As nouns, hat is a hypernym of felt hat; that is, hat is a word with a broader meaning than felt hat:

felt hat: a hat made of felt with a creased crown
hat: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of felt hat include chapeau, lid.

felt hat (noun)	hat (noun)
a hat made of felt with a creased crown	an informal term for a person's role
	headdress that protects the head from bad weather; has shaped crown and usually a brim

felt hat (verb)	hat (verb)
	put on or wear a hat
	furnish with a hat