community cat vs estray

community cat

noun
  • A feral cat. 

estray

noun
  • An animal that has escaped from its owner; a wandering animal whose owner is unknown. An animal cannot be an estray when on the range where it was raised, and permitted by its owner to run. A lost animal whose owner is known to the party at hand is not an estray. 

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