chromatic vs umber

chromatic is not a noun while umber is a noun.

Word	Noun	Adjective	Verb	Adverb
chromatic	No	Yes	No	No
umber	Yes	Yes	No	No

chromatic (noun)	umber (noun)
	a medium brown to dark-brown color
	an earth pigment

chromatic (adjective)	umber (adjective)
being or having or characterized by hue	of the color of any of various natural brown earth pigments
based on a scale consisting of 12 semitones
able to refract light without spectral color separation