killerball vs murderball

killerball

noun
  • Synonym of murderball (“team sport resembling dodgeball”) 

murderball

noun
  • A team sport resembling dodgeball in which players are eliminated ("murdered") by being struck with the ball. 

  • Wheelchair rugby. 

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