red-blindness vs protanopia

red-blindness and protanopia both are nouns.

Word	Noun	Adjective	Verb	Adverb
red-blindness	Yes	No	No	No
protanopia	Yes	No	No	No

As nouns, red-blindness and protanopia are synonyms defined as:

red-blindness and protanopia: dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue

red-blindness (noun)	protanopia (noun)
dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue	dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue