person of colour vs somebody

person of colour and somebody both are nouns.

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

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

person of colour: (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 colour include individual, mortal, person, someone, soul.

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