decameter vs American spelling

decameter and American spelling both are nouns.

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

decameter (noun)	American spelling (noun)
a metric unit of length equal to ten meters	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')