American spelling vs square centimeter

American spelling and square centimeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
square centimeter	Yes	No	No	No

American spelling (noun)	square centimeter (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a unit of area measurement equivalent to 1 centimeter in length multiplied by 1 centimeter in width, where one centimeter equals 0.3937 inch.