horoscopy vs sortilege

horoscopy

noun
  • The casting of horoscopes. 

  • The aspect of the stars at the time of a person's birth. 

sortilege

noun
  • Witchcraft, magic, especially as a means of making decisions or predictions. 

How often have the words horoscopy and sortilege occurred in a corpus of books? (source: Google Ngram Viewer )