catastrophe vs flying dragon

catastrophe

noun
  • The dramatic event that initiates the resolution of the plot; the dénouement. 

  • A disaster beyond expectations. 

  • Any large and disastrous event of great significance. 

  • A type of bifurcation, where a system shifts between two stable states. 

flying dragon

noun
  • Used other than figuratively or idiomatically: see flying, dragon. 

  • Draco volans, a gliding lizard endemic to Southeast Asia. 

  • Any lizard in the genus Draco. 

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