calculate vs calculation

calculate is not a noun while calculation is a noun.

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

calculate (noun)	calculation (noun)
	the procedure of calculating; determining something by mathematical or logical methods
	problem solving that involves numbers or quantities
	planning something carefully and intentionally

calculate (verb)	calculation (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