people of color vs American spelling

people of color and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
people of color	Yes	No	No	No
American spelling	Yes	No	No	No

people of color (noun)	American spelling (noun)
a race with skin pigmentation different from the white race (especially Blacks)	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')