footy vs rugby

footy

noun
  • The game or sport of football, usually Australian rules football or rugby league, but not soccer 

  • A football fan. 

  • Football (association football) (soccer in US, Canada, Australia, New Zealand) 

  • The ball used in a game of footy. 

  • A short sock. 

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. 

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