rationalise vs get rid of

rationalise and get rid of both are verbs.

Word	Noun	Adjective	Verb	Adverb
rationalise	No	No	Yes	No
get rid of	No	No	Yes	No

As verbs, get rid of is a hypernym of rationalise; that is, get rid of is a word with a broader meaning than rationalise:

Other hypernyms of rationalise include do away with, eliminate, extinguish.

rationalise (verb)	get rid of (verb)
weed out unwanted or unnecessary things	terminate, end, or take out
remove irrational quantities from	dispose of
think rationally; employ logic or reason	do away with
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