American spelling vs harmonize

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

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

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

American spelling (verb)	harmonize (verb)
	bring into consonance, harmony, or accord while making music or singing
	bring into consonance or accord
	bring (several things) into consonance or relate harmoniously
	sing or play in harmony
	write a harmony for
	go together