American spelling vs spectral color

American spelling and spectral color both are nouns.

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

American spelling (noun)	spectral color (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a color that has hue