monochromasy vs monochromatism

monochromasy and monochromatism both are nouns.

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

As nouns, monochromasy and monochromatism are synonyms defined as:

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

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

monochromasy (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