centralization vs American spelling

centralization and American spelling both are nouns.

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

centralization (noun)	American spelling (noun)
the act of consolidating power under a central control	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
gathering to a center