fur hat vs beaver

fur hat and beaver both are nouns.

Word	Noun	Adjective	Verb	Adverb
fur hat	Yes	No	No	No
beaver	Yes	No	Yes	No

As nouns, beaver is a hyponym of fur hat; that is, beaver is a word with a more specific, narrower meaning than fur hat:

Other hyponyms of fur hat include castor.

fur hat (noun)	beaver (noun)
a hat made of fur	large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges
	a hat made with the fur of a beaver (or similar material)
	a movable piece of armor on a medieval helmet used to protect the lower face
	a man's hat with a tall crown; usually covered with silk or with beaver fur
	a full beard
	the soft brown fur of the beaver

fur hat (verb)	beaver (verb)
	work hard on something