horseflesh vs racehorse

horseflesh

noun
  • Horses collectively, with reference to driving, riding, or racing. 

  • A species of Bahama mahogany, Lysiloma sabicu and Lysiloma latisiliquum. 

  • The flesh of a horse; horsemeat. 

adj
  • Of the colour of horseflesh; of a peculiar reddish-brown hue. 

racehorse

noun
  • A horse that competes in races. 

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