forecast vs calculate

forecast is a noun but calculate is not a noun.

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

As verbs, forecast and calculate are synonyms defined as:

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

As verbs, forecast and calculate are synonyms defined as:

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

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