epicenter vs American spelling

epicenter and American spelling both are nouns.

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

epicenter (noun)	American spelling (noun)
the point on the Earth's surface directly above the focus of an earthquake	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')