rationalise vs rationalisation

rationalise is not a noun while rationalisation is a noun.

Word	Noun	Adjective	Verb	Adverb
rationalise	No	No	Yes	No
rationalisation	Yes	No	No	No

rationalise (noun)	rationalisation (noun)
	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

rationalise (verb)	rationalisation (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