monochromasy vs monochromia

monochromasy and monochromia both are nouns.

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

As nouns, monochromasy and monochromia are synonyms defined as:

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

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

monochromasy (noun)	monochromia (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