sable vs coal black

sable and coal black both are nouns.

Word	Noun	Adjective	Verb	Adverb
sable	Yes	Yes	No	No
coal black	Yes	No	No	No

As nouns, sable and coal black are synonyms defined as:

Other synonyms of sable include ebony, jet black, pitch black, soot black.

sable (noun)	coal black (noun)
marten of northern Asian forests having luxuriant dark brown fur	a very dark black
a scarf (or trimming) made of sable
an artist's brush made of sable hairs
a very dark black
the expensive dark brown fur of the marten

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