jester vs jestress

jester

noun
  • One who jests, jokes or teases. 

  • A person in colourful garb and fool's cap who amused a medieval and early modern royal or noble court. 

  • Any of various nymphalid butterflies of the Southeast Asian genus Symbrenthia. 

jestress

noun
  • A female jester 

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