apologise vs rationalise

apologise and rationalise both are verbs.

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

As verbs, apologise and rationalise are synonyms defined as:

apologise and rationalise: defend, explain, clear away, or make excuses for by reasoning

Other synonyms of apologise include apologize, excuse, rationalize.

apologise (verb)	rationalise (verb)
acknowledge faults or shortcomings or failing	weed out unwanted or unnecessary things
defend, explain, clear away, or make excuses for by reasoning	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