cheetah vs leopard

cheetah

noun
  • A distinctive member (Acinonyx jubatus) of the cat family, slightly smaller than the leopard, but with proportionately longer limbs and a smaller head; native to Africa and southeast Asia (where it is nearly extinct) and also credited with being the fastest terrestrial animal. 

leopard

noun
  • A similar-looking, large wild cat named after the leopard. 

  • The snow leopard (Panthera uncia), a large wild cat native to Asia. 

  • A lion passant guardant. 

  • Panthera pardus, a large wild cat with a spotted coat native to Africa and Asia, especially the male of the species (in contrast to leopardess). 

  • Any of various nymphalid butterflies of the genus Phalanta, having black markings on an orange base. 

  • The clouded leopard (Neofelis nebulosa), a large wild cat native to Asia. 

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