fur vs pelage

fur and pelage both are nouns.

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

As nouns, pelage is a hypernym of fur; that is, pelage is a word with a broader meaning than fur:

fur: dense coat of fine silky hairs on mammals (e.g., cat or seal or weasel)
pelage: growth of hair or wool or fur covering the body of an animal

Other hypernyms of fur include coat.

fur (noun)	pelage (noun)
dense coat of fine silky hairs on mammals (e.g., cat or seal or weasel)	growth of hair or wool or fur covering the body of an animal
a garment made of animal pelts or synthetic fur
the dressed hairy coat of a mammal