big cat vs leopard

big cat

noun
  • Any large feline animal, especially one of the Panthera genus, including tigers, lions, jaguars and leopards. 

  • Used other than figuratively or idiomatically: see big, cat. 

leopard

noun
  • 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). 

  • 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. 

  • 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 big cat and leopard occurred in a corpus of books? (source: Google Ngram Viewer )