punching bag vs tyrant

punching bag

noun
  • A person serving as an object of abuse. 

  • A tough bag, usually cylindrical, filled with air, sand, or other material, often suspended so that it swings freely, which is punched or kicked when practising sports such as boxing or martial arts. 

tyrant

noun
  • Any person who abuses the power of position or office to treat others unjustly, cruelly, or harshly. 

  • A usurper; one who gains power and rules extralegally, distinguished from kings elevated by election or succession. 

  • A despot; a ruler who governs unjustly, cruelly, or harshly. 

  • A villain; a person or thing who uses strength or violence to treat others unjustly, cruelly, or harshly. 

  • The tyrant birds, members of the family Tyrannidae, which often fight or drive off other birds which approach their nests. 

adj
  • Tyrannical, tyrannous; like, characteristic of, or in the manner of a tyrant. 

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