cautionary tale vs critique

cautionary tale

noun
  • A story, originally told in folklore, to warn its audience of a certain danger. 

critique

noun
  • A point made to criticize something. 

  • An essay in which another piece of work is criticised, reviewed, etc. 

  • The art of criticism. 

verb
  • To review something; to criticize. 

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