hart vs red deer

hart

noun
  • A male red deer or one of related species. 

  • A male deer, especially the male of the red deer after his fifth year. 

red deer

noun
  • The wapiti or North American elk, Cervus canadensis, a deer species of North America, long believed to be a subspecies of the European red deer. 

  • A species of large deer, Cervus elaphus, found in Europe and southwestern Asia. 

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