magistrate vs warrant officer

magistrate

noun
  • A judicial officer with limited authority to administer and enforce the law. A magistrate's court may have jurisdiction in civil or criminal cases, or both. 

  • A comparable official in medieval or modern institutions. 

  • A master's degree. 

  • A high official of the state or a municipality in ancient Greece or Rome. 

warrant officer

noun
  • An officer holding rank by virtue of a warrant rather than a commission. 

  • An officer assigned to execute warrants and other writs. 

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