auto racing vs bout

auto racing

noun
  • Any of various sports in which automobiles (motor cars) are raced, either around a track, on roads or across country 

bout

noun
  • A roller derby match. 

  • A fighting competition. 

  • A bulge or widening in a musical instrument, such as either of the two characteristic bulges of a guitar. 

  • An assault (a fencing encounter) at which the score is kept. 

  • A boxing match. 

  • A period of something, especially one painful or unpleasant. 

prep
  • Aphetic form of about 

verb
  • To contest a bout. 

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