American spelling vs epicenter

American spelling and epicenter both are nouns.

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

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