deer vs elk

deer

noun
  • One of the smaller animals of this family, distinguished from a moose or elk 

  • The meat of such an animal; venison. 

  • A ruminant mammal with antlers and hooves of the family Cervidae, or one of several similar animals from related families of the order Artiodactyla. 

elk

noun
  • Any moose (Alces alces), the largest member of the deer family. 

  • Any of the subspecies of the moose (Alces alces, alternatively named Eurasian elk to avoid confusion with the wapiti), that occurs only in Europe and Asia. 

  • common wapiti (Cervus canadensis), the second largest member of the deer family, once thought to be a subspecies of red deer. 

  • Sambar (Cervus unicolor). 

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