tagati vs völva

tagati

noun
  • In South African English, a wizard, witch, or a spiteful person who operates in secret to harm others or who uses poisons and familiar spirits to carry out harmful deeds. 

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 tagati and völva occurred in a corpus of books? (source: Google Ngram Viewer )