prognosis vs foretelling

prognosis and foretelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
prognosis	Yes	No	No	No
foretelling	Yes	No	No	No

As nouns, foretelling is a hypernym of prognosis; that is, foretelling is a word with a broader meaning than prognosis:

Other hypernyms of prognosis include forecasting, prediction, prognostication.

prognosis (noun)	foretelling (noun)
a prediction of the course of a disease	the art or gift of prophecy (or the pretense of prophecy) by supernatural means
a prediction about how something (as the weather) will develop	a statement made about the future