horoscope vs foretelling

horoscope and foretelling both are nouns.

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

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

horoscope: a prediction of someone's future based on the relative positions of the planets
foretelling: a statement made about the future

Other hypernyms of horoscope include forecasting, prediction, prognostication.

horoscope (noun)	foretelling (noun)
a diagram of the positions of the planets and signs of the zodiac at a particular time and place	the art or gift of prophecy (or the pretense of prophecy) by supernatural means
a prediction of someone's future based on the relative positions of the planets	a statement made about the future