American spelling vs linear meter

American spelling and linear meter both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
linear meter	Yes	No	No	No

American spelling (noun)	linear meter (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a meter in which the deflection of the pointer is proportional to the quantity measured.