rugby vs volleyball

rugby

noun
  • A form of football in which players can hold or kick an ovoid ball; rugby football. The ball cannot be handled forwards and points are scored by touching the ball to the ground in the area past the opponent's territory or by kicking the ball between goalposts and over a crossbar. 

  • The form of the game known as rugby union (see the usage note). 

  • Rubber cement, contact cement. 

verb
  • To play rugby. 

volleyball

noun
  • A game played on a rectangular court between two teams of two to six players which involves striking a ball back and forth over a net. 

  • The inflated ball used in such a game. 

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