equestrian vs racehorse

equestrian

noun
  • One who rides a horse. 

  • Synonym of eques 

adj
  • Of or relating to the ancient Roman class of equites. 

  • Of horseback riding or horseback riders. 

racehorse

noun
  • A horse that competes in races. 

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