American spelling vs poster color

American spelling and poster color both are nouns.

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

American spelling (noun)	poster color (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	pigment mixed with water-soluble glutinous materials such as size and egg yolk