basketball vs rugby ball

basketball

noun
  • The particular kind of ball used in the sport of basketball. 

  • A sport in which two opposing teams of five players strive to put a ball through a hoop. 

verb
  • To throw in a similar way to when shooting a basketball 

  • To play basketball 

rugby ball

noun
  • A spheroidal ball designed for the sport of rugby. 

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