cynanthropy vs lunacy

cynanthropy

noun
  • A delusion in which a person believes he or she is transformed into a dog. 

  • A shape-shifting ability between human and canine forms. 

lunacy

noun
  • Something deeply misguided. 

  • a cyclical mental disease, apparently linked to the lunar phases 

  • insanity implying legal irresponsibility. 

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