pugilist vs punching bag

pugilist

noun
  • One who fights with their fists; especially a professional prize fighter; a boxer. 

punching bag

noun
  • 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. 

  • A person serving as an object of abuse. 

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