fighter vs punching bag

fighter

noun
  • A person who fights; a combatant. 

  • A warrior; a fighting soldier. 

  • A pugnacious, competitive person. 

  • A participant in boxing or any martial art. 

  • A person with a strong determination to resist protracted or severe adversity, especially illness. 

  • A firefighter. 

  • A game with a focus on physical combat. 

  • A class of fixed-wing aircraft whose primary purpose is to shoot down other aircraft, sometimes accompanied by a secondary purpose of attacking ground targets. 

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. 

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