harmonization vs American spelling

harmonization and American spelling both are nouns.

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

harmonization (noun)	American spelling (noun)
singing in harmony	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
a piece of harmonized music