calculation vs calculate

calculation is a noun but calculate is not a noun.

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

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

calculation (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