person of color vs somebody

person of color and somebody both are nouns.

Word	Noun	Adjective	Verb	Adverb
person of color	Yes	No	No	No
somebody	Yes	No	No	No

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

person of color: (formal) any non-European non-white person
somebody: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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

person of color (noun)	somebody (noun)
(formal) any non-European non-white person	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential