decentralization vs American spelling

decentralization and American spelling both are nouns.

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

decentralization (noun)	American spelling (noun)
the spread of power away from the center to local branches or governments	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
the social process in which population and industry moves from urban centers to outlying districts