American spelling vs decentralization

American spelling and decentralization both are nouns.

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

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