cops vs kotwal

cops

noun
  • The police, considered as a group entity. 

  • The connecting crook of a harrow. 

kotwal

noun
  • The local police chief or magistrate of a town or city in India or the East Indies. 

  • The leader of a kot or fort in medieval India. 

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