color-blind person vs somebody

color-blind person and somebody both are nouns.

Word	Noun	Adjective	Verb	Adverb
color-blind person	Yes	No	No	No
somebody	Yes	No	No	No

As nouns, somebody is a hypernym of color-blind person; that is, somebody is a word with a broader meaning than color-blind person:

color-blind person: a person unable to distinguish differences in hue
somebody: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of color-blind person include individual, mortal, person, someone, soul.

color-blind person (noun)	somebody (noun)
a person unable to distinguish differences in hue	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential