foretell vs forecast

foretell is not a noun while forecast is a noun.

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

As verbs, forecast is a hyponym of foretell; that is, forecast is a word with a more specific, narrower meaning than foretell:

Other hyponyms of foretell include read, outguess, second-guess, augur, bet, wager, calculate, prophesy, vaticinate.

As verbs, foretell and forecast are synonyms defined as:

Other synonyms of foretell include augur, auspicate, betoken, bode, foreshadow, omen, portend, predict, prefigure, presage, prognosticate.

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

foretell (verb)	forecast (verb)
make a prediction about; tell in advance	judge to be probable
indicate, as with a sign or an omen	predict in advance
foreshadow or presage	indicate, as with a sign or an omen