sable vs fur

sable and fur both are nouns.

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

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

Other hypernyms of sable include pelt.

sable (noun)	fur (noun)
marten of northern Asian forests having luxuriant dark brown fur	dense coat of fine silky hairs on mammals (e.g., cat or seal or weasel)
a scarf (or trimming) made of sable	a garment made of animal pelts or synthetic fur
an artist's brush made of sable hairs	the dressed hairy coat of a mammal
a very dark black
the expensive dark brown fur of the marten

sable (adjective)	fur (adjective)
of a dark somewhat brownish black