monochromacy vs monochromasy

monochromacy and monochromasy both are nouns.

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

As nouns, monochromacy and monochromasy are synonyms defined as:

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

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

monochromacy (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