horoscope vs forecasting

horoscope and forecasting both are nouns.

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

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

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

Other hypernyms of horoscope include foretelling, prediction, prognostication.

horoscope (noun)	forecasting (noun)
a diagram of the positions of the planets and signs of the zodiac at a particular time and place	a statement made about the future
a prediction of someone's future based on the relative positions of the planets