American spelling vs emphasize

American spelling is a noun but emphasize is not a noun.

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

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

American spelling (verb)	emphasize (verb)
	to stress, single out as important
	give extra weight to (a communication)