hecatomb vs pogrom

hecatomb

noun
  • Any great sacrifice; a great number of people, animals or things, especially as sacrificed or destroyed; a large amount. 

  • A great feast and public sacrifice to the gods, originally of a hundred oxen. 

pogrom

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

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. 

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