leopard vs snow panther

leopard

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

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

  • 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. 

snow panther

noun
  • snow leopard 

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