charcoal-grey vs charcoal

charcoal-grey is not a noun while charcoal is a noun.

Word	Noun	Adjective	Verb	Adverb
charcoal-grey	No	Yes	No	No
charcoal	Yes	Yes	Yes	No

As adjectives, charcoal-grey and charcoal are synonyms defined as:

Other synonyms of charcoal-grey include charcoal-gray.

charcoal-grey (noun)	charcoal (noun)
	a stick of black carbon material used for drawing
	a drawing made with a stick of black carbon material
	a very dark grey color
	a carbonaceous material obtained by heating wood or other organic matter in the absence of air

charcoal-grey (adjective)	charcoal (adjective)
of a very dark grey	of a very dark grey

charcoal-grey (verb)	charcoal (verb)
	draw, trace, or represent with charcoal