overemphasize vs American spelling

overemphasize is not a noun while American spelling is a noun.

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

overemphasize (noun)	American spelling (noun)
	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

overemphasize (verb)	American spelling (verb)
place special or excessive emphasis on