devastation vs mass murder

devastation

noun
  • The act of devastating, or the state of being devastated; a laying waste. 

  • Waste or misapplication of the assets of a deceased person by an executor or administrator; devastavit. 

mass murder

noun
  • The killing of a large number of people over a short period of time. 

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