monochromia vs monochromasy

monochromia and monochromasy both are nouns.

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

As nouns, monochromia and monochromasy are synonyms defined as:

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

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

monochromia (noun)	monochromasy (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