rugby vs rugger

rugby

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

  • 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. 

  • Rubber cement, contact cement. 

verb
  • To play rugby. 

rugger

noun
  • rugby 

  • rugby player 

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