dukun vs völva

dukun

noun
  • A Malay shaman or witch doctor. 

völva

noun
  • Any prophetess, sooth-sayer, or witch. 

  • In Old Norse society, a female practitioner of magic divination and prophecy. 

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