burgomaster vs fed

burgomaster

noun
  • The mayor, or head magistrate, of a town in the Netherlands, Belgium, Germany and certain other countries. 

fed

noun
  • A police officer. 

  • A federal government officer or official, especially a FBI, CIA, NSA, ATF, or DEA agent. 

  • A federation in which powerlifters organize to compete. 

  • The Canadian federal government. 

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