calculate vs forecast

calculate is not a noun while forecast is a noun.

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

As verbs, calculate and forecast are synonyms defined as:

Other synonyms of calculate include count on, estimate, figure, reckon.

As verbs, calculate and forecast are synonyms defined as:

calculate (noun)	forecast (noun)
	a prediction about how something (as the weather) will develop

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