charcoal vs charcoal gray

charcoal and charcoal gray both are nouns.

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

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

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

charcoal (noun)	charcoal gray (noun)
a stick of black carbon material used for drawing	a very dark grey color
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 (adjective)	charcoal gray (adjective)
of a very dark grey

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