oil color vs American spelling

oil color and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil color	Yes	No	No	No
American spelling	Yes	No	No	No

oil color (noun)	American spelling (noun)
oil paint containing pigment that is used by an artist	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')