burgomaster vs syndic

burgomaster

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

syndic

noun
  • A government official having different duties depending on the country; also, a magistrate, especially one of the Chief Magistrates of Geneva, Switzerland. 

  • An agent of a corporation, or of any body of people engaged in a business enterprise; specifically, in the University of Cambridge, a member of the senate appointed to carry out specific duties. 

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