carburetor vs American spelling

carburetor and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
carburetor	Yes	No	No	No
American spelling	Yes	No	No	No

carburetor (noun)	American spelling (noun)
mixes air with gasoline vapor prior to explosion	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')