bobcat vs feral cat

bobcat

noun
  • A North American wildcat, Lynx rufus, having tufted ears and a short tail. 

  • A multi-purpose construction vehicle, akin to a smaller version of a front-end loader or a backhoe (backhoe loader), with a one-man caged control cabin. 

feral cat

noun
  • A domestic cat that has returned to or was born in a living situation without human care. 

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