crystal-gazing vs precognition

crystal-gazing

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

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

precognition

noun
  • Knowledge of the future; understanding of something in advance, especially as a form of supernatural or extrasensory perception. 

  • The practice of taking a factual statement from a witness before a trial. 

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