monochromasy vs monochromatic vision

monochromasy and monochromatic vision both are nouns.

Word	Noun	Adjective	Verb	Adverb
monochromasy	Yes	No	No	No
monochromatic vision	Yes	No	No	No

As nouns, monochromasy and monochromatic vision are synonyms defined as:

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

Other synonyms of monochromasy include monochromacy, monochromatism, monochromia.

monochromasy (noun)	monochromatic vision (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