alley cat vs farm cat

alley cat

noun
  • An urban feral cat. 

  • A slut, a sexually promiscuous woman or prostitute. 

farm cat

noun
  • A domestic cat, usually of a mixed breed, that lives primarily outdoors, in a feral or semiferal condition on agricultural properties. 

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