big cat vs working girl

big cat

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

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

working girl

noun
  • Used other than figuratively or idiomatically: see working, girl. 

  • A female prostitute. 

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