American spelling vs de-emphasize

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

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

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

American spelling (verb)	de-emphasize (verb)
	reduce the emphasis