devastation vs ethnic cleansing

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. 

ethnic cleansing

noun
  • The mass expulsion or killing of people belonging to one ethnic group by those of another. 

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