fallow deer vs hart

fallow deer

noun
  • A ruminant mammal (Dama dama) belonging to the family Cervidae. 

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. 

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