charcoal vs achromatic

charcoal is a noun but achromatic is not a noun.

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

charcoal (noun)	achromatic (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 (adjective)	achromatic (adjective)
of a very dark grey	having no hue

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