killerball vs wheelchair rugby

killerball

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

wheelchair rugby

noun
  • A variation of rugby played by players in wheelchairs, primarily players with some disability. It is a full-contact sport and is played on a hardwood court with a ball similar to a basketball. 

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