horse race vs horse racing

horse race

noun
  • A competitive race for horses carrying jockeys; often the subject of betting 

  • An exciting and arduous competition (as in a political campaign). 

horse racing

noun
  • A sport where horses and their jockeys compete to race around a track the fastest. 

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