tagati vs theurgist

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. 

theurgist

noun
  • One who claims or is alleged to perform magic with the aid of beneficent spirits. 

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