calculator vs calculate

calculator is a noun but calculate is not a noun.

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

calculator (noun)	calculate (noun)
a small machine that is used for mathematical calculations; can be mechanical or electronic
an expert at calculation (or at operating calculating machines)

calculator (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