big cat vs queen of beasts

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. 

queen of beasts

noun
  • The lioness. 

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