courser vs draft horse

courser

noun
  • A racehorse or a charger. 

  • A person who practises coursing. 

  • Any of several species of bird in the genera Cursorius or Rhinoptilus of the family Glareolidae. 

  • A dog used for coursing. 

  • A stone used in building a course. 

  • A hunter. 

draft horse

noun
  • A horse of a race specifically bred for such work, heavier and stronger than a mount. 

  • A horse used for muscular work, other than carrying a rider and/or load, such as pulling a cart, plow or log. 

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