sable vs pitch black

sable and pitch black both are nouns.

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

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

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

sable (noun)	pitch 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)	pitch black (adjective)
of a dark somewhat brownish black