muskrat fur vs muskrat

muskrat fur and muskrat both are nouns.

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

As nouns, muskrat fur and muskrat are synonyms defined as:

muskrat fur (noun)	muskrat (noun)
the brown fur of a muskrat	beaver-like aquatic rodent of North America with dark glossy brown fur
	the brown fur of a muskrat