horoscopy vs astrology

horoscopy and astrology both are nouns.

Word	Noun	Adjective	Verb	Adverb
horoscopy	Yes	No	No	No
astrology	Yes	No	No	No

As nouns, astrology is a hypernym of horoscopy; that is, astrology is a word with a broader meaning than horoscopy:

horoscopy: the drawing up and interpretation of horoscopes
astrology: a pseudoscience claiming divination by the positions of the planets and sun and moon

Other hypernyms of horoscopy include star divination.

horoscopy (noun)	astrology (noun)
the drawing up and interpretation of horoscopes	a pseudoscience claiming divination by the positions of the planets and sun and moon