dichromasy vs color blindness

dichromasy and color blindness both are nouns.

Word	Noun	Adjective	Verb	Adverb
dichromasy	Yes	No	No	No
color blindness	Yes	No	No	No

As nouns, color blindness is a hypernym of dichromasy; that is, color blindness is a word with a broader meaning than dichromasy:

dichromasy: a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)
color blindness: genetic inability to distinguish differences in hue

Other hypernyms of dichromasy include color vision deficiency, colour blindness, colour vision deficiency.

dichromasy (noun)	color blindness (noun)
a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)	genetic inability to distinguish differences in hue