flooding vs tragedy

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. 

tragedy

noun
  • A disastrous event, especially one involving great loss of life or injury. 

  • A drama or similar work, in which the main character is brought to ruin or otherwise suffers the extreme consequences of some tragic flaw or weakness of character. 

  • The genre of such works, and the art of producing them. 

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