burgomaster vs judicial officer

burgomaster

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

judicial officer

noun
  • A huissier de justice, a process server and officer of the court in several European countries. 

  • A public officer authorized to hear and decide cases in a court of law. 

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