spectral color vs American spelling

spectral color and American spelling both are nouns.

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

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