charcoal vs fusain

charcoal and fusain both are nouns.

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

As nouns, charcoal and fusain are synonyms defined as:

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

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