frankpledge vs mass destruction

frankpledge

noun
  • Any group so similarly answerable for the conduct of all its members and liable for collective punishment. 

  • A decener: a member of a tithing bound in frankpledge. 

  • The tithing itself. 

  • A form of collective suretyship and punishment under English law among the members of a tithing. 

mass destruction

noun
  • Killing of large numbers of people. 

  • Used other than figuratively or idiomatically: see mass, destruction. 

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