American spelling vs centralizing

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

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

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

American spelling (adjective)	centralizing (adjective)
	tending to draw to a central point