ochre vs chromatic

ochre is a noun but chromatic is not a noun.

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

ochre (noun)	chromatic (noun)
a moderate yellow-orange to orange color
any of various earths containing silica and alumina and ferric oxide; used as a pigment

ochre (adjective)	chromatic (adjective)
of a moderate orange-yellow color	being or having or characterized by hue
	based on a scale consisting of 12 semitones
	able to refract light without spectral color separation