charcoal grey vs charcoal

charcoal grey and charcoal both are nouns.

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

As nouns, charcoal grey and charcoal are synonyms defined as:

Other synonyms of charcoal grey include charcoal gray, oxford gray, oxford grey.

charcoal grey (noun)	charcoal (noun)
a very dark grey color	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

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