calculate vs calculator

calculate is not a noun while calculator is a noun.

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

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

calculate (verb)	calculator (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