augury vs crystal-gazing

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. 

crystal-gazing

noun
  • The making of predictions about the future, especially when these are seen as very speculative. 

  • The action or practice of gazing into a crystal ball in the hope or belief of seeing the future. 

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