rationalisation vs defence

rationalisation and defence both are nouns.

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

As nouns, defence is a hypernym of rationalisation; that is, defence is a word with a broader meaning than rationalisation:

rationalisation: (psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening
defence: (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires

Other hypernyms of rationalisation include defence mechanism, defence reaction, defense, defense mechanism, defense reaction.

rationalisation (noun)	defence (noun)
systematic organization; the act of organizing something according to a system or a rationale	(military) military action or resources protecting a country against potential enemies
(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 act of defending someone or something against attack or injury
the organization of a business according to scientific principles of management in order to increase efficiency	a defendant's answer or plea denying the truth of the charges against him
the cognitive process of making something seem consistent with or based on reason	protection from harm
(psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening	a structure used to defend against attack
	the justification for some act or belief
	the speech act of answering an attack on your assertions
	the defendant and his legal advisors collectively
	(sports) the team that is trying to prevent the other team from scoring
	an organization of defenders that provides resistance against attack
	(psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires