charcoal vs grayness

charcoal and grayness both are nouns.

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

As nouns, grayness is a hypernym of charcoal; that is, grayness is a word with a broader meaning than charcoal:

Other hypernyms of charcoal include gray, grey, greyness.

charcoal (noun)	grayness (noun)
a stick of black carbon material used for drawing	a neutral achromatic color midway between white and black
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)	grayness (adjective)
of a very dark grey

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