czar vs high priestess

czar

noun
  • An appointed official tasked to regulate or oversee a specific area. 

high priestess

noun
  • A third degree (sometimes forth degree) female witch in Wicca. 

  • A female clergyman with a higher function than a normal priestess. 

  • the second trump or major arcana card in most traditional tarot decks. 

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