linear meter vs American spelling

linear meter and American spelling both are nouns.

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

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