shaman vs volkhv

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. 

volkhv

noun
  • a pre-Christian priest from Slavic cultures 

  • a priest from Slavic neopaganism 

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