farm cat vs kitty

farm cat

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

kitty

noun
  • A kitten or young cat. 

  • In a home game, a small, specified amount taken from each pot to pay the host's expenses. 

  • A set of additional cards dealt face down in some games. 

  • A money pool used for a particular purpose, such as for a card game or for shared expenses. 

  • A pet name for a cat. 

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