monochromatism vs monochromatic

monochromatism is a noun but monochromatic is not a noun.

Word	Noun	Adjective	Verb	Adverb
monochromatism	Yes	No	No	No
monochromatic	No	Yes	No	No

monochromatism (noun)	monochromatic (noun)
complete color blindness; colors can be differentiated only on the basis of brightness

monochromatism (adjective)	monochromatic (adjective)
	(of light or other electromagnetic radiation) having only one wavelength
	of or relating to monochromatism
	having or appearing to have only one color