maths vs calculate

maths is a noun but calculate is not a noun.

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

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

maths (verb)	calculate (verb)
	make a mathematical calculation or computation
	specifically design a product, event, or activity for a certain public
	judge to be probable
	have faith or confidence in
	predict in advance
	keep an account of