augury vs sortilege

augury

noun
  • An omen or prediction; a foreboding; a prophecy. 

  • A divination based on the appearance and behaviour of animals. 

  • An event that is experienced as indicating important things to come. 

sortilege

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

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