ethnic cleansing vs pogrom

ethnic cleansing

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

pogrom

noun
  • A riot aimed at persecution or massacre of a particular ethnic or religious group, usually Jews. 

  • An antisemitic hate crime with a large death toll, irrespective of the number of perpetrators. 

verb
  • To persecute or massacre a particular group of people. 

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