bobsleigh vs dogsled

bobsleigh

noun
  • The sled used in the sport of bobsleigh. 

  • A winter sport in which teams make timed runs down narrow, twisting, banked purpose-built iced tracks in a gravity-powered sled. 

verb
  • To ride a bobsleigh. 

dogsled

noun
  • A sled, pulled by dogs over ice and snow. 

verb
  • to ride on a dogsled 

  • to race dogsleds 

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