American spelling vs rationalize

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

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

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

American spelling (verb)	rationalize (verb)
	weed out unwanted or unnecessary things
	remove irrational quantities from
	think rationally; employ logic or reason
	defend, explain, clear away, or make excuses for by reasoning
	structure and run according to rational or scientific principles in order to achieve desired results