maths vs rationalise

maths is a noun but rationalise is not a noun.

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

maths (noun)	rationalise (noun)
a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement

maths (verb)	rationalise (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