surf vs surfboard

surf

verb
  • To ride a wave on a surfboard; to pursue or take part in the sport of surfing. 

  • To bodysurf; to swim in the surf at a beach. 

  • To surf at a specified place. 

  • To browse the Internet, television, etc. 

noun
  • A dance popular in the 1960s in which the movements of a surfboard rider are mimicked. 

  • The bottom of a drain. 

  • An instance or session of riding a surfboard in the surf. 

  • Waves that break on an ocean shoreline. 

surfboard

verb
  • To use a surfboard; to surf. 

noun
  • A shaped waterproof plank, usually made of wood or foam and reinforced plastic, used to surf on waves. 

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