great cat vs megafelid

great cat

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

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

megafelid

noun
  • big cat 

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