cataclysm vs flooding

cataclysm

noun
  • A great flood. 

  • A sudden, violent event. 

  • A sudden and violent change in the earth's crust. 

flooding

noun
  • An act of flooding; a flood or gush. 

  • A form of therapy that treats a phobia by suddenly exposing the patient to the object of the phobia, instead of approaching it gradually. 

  • Emotional overwhelm sometimes leading to a primal state of rage or panic. 

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