protanopia vs red-blindness

protanopia and red-blindness both are nouns.

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

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

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

protanopia (noun)	red-blindness (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