American spelling vs rationalization

American spelling and rationalization both are nouns.

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

American spelling (noun)	rationalization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	systematic organization; the act of organizing something according to a system or a rationale
	(mathematics) the simplification of an expression or equation by eliminating radicals without changing the value of the expression or the roots of the equation
	the organization of a business according to scientific principles of management in order to increase efficiency
	the cognitive process of making something seem consistent with or based on reason
	(psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening