cynanthropy vs instability

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. 

instability

noun
  • A state that is not in equilibrium, or in which a small change has a large irreversible effect. 

  • The quality of being unstable. 

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