pelt vs muskrat fur

pelt and muskrat fur both are nouns.

Word	Noun	Adjective	Verb	Adverb
pelt	Yes	No	Yes	No
muskrat fur	Yes	No	No	No

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

pelt (noun)	muskrat fur (noun)
body covering of a living animal	the brown fur of a muskrat
the dressed hairy coat of a mammal

pelt (verb)	muskrat fur (verb)
attack and bombard with or as if with missiles
cast, hurl, or throw repeatedly with some missile
rain heavily