diviner vs shaman

diviner

noun
  • One who divines or conjectures. 

  • One who searches for underground objects or water using a divining rod. 

  • One who foretells the future. 

shaman

noun
  • A traditional (unscientific) faith healer. 

  • A member of certain tribal societies who acts as a spiritual and, or religious medium between the concrete and spirit worlds. 

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