Mar vs Terror

Mar

name
  • An earldom in the Scottish peerage. 

noun
  • A title of respect in Syriac, given to all saints and also used before the Christian names of bishops. 

Terror

name
  • Any specific one of several historical reigns of terror. 

  • The Reign of Terror during the French Revolution. 

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