pitch black vs sable

pitch black and sable both are nouns.

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

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

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

pitch black (noun)	sable (noun)
a very dark black	marten of northern Asian forests having luxuriant dark brown fur
	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

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