monochromia vs monochromatism

monochromia and monochromatism both are nouns.

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

As nouns, monochromia and monochromatism are synonyms defined as:

monochromia and monochromatism: complete color blindness; colors can be differentiated only on the basis of brightness

Other synonyms of monochromia include monochromacy, monochromasy, monochromatic vision.

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