feral vs mammal

feral

noun
  • A domesticated animal that has returned to the wild; an animal, particularly a domesticated animal, living independently of humans. 

  • A person who has isolated themselves from the outside world; one living an alternative lifestyle. 

  • A contemptible young person, a lout, a person who behaves wildly. 

  • A character in furry art or literature which has the physical characteristics (body) of a regular animal (typically quadripedal), that may or may not be able to communicate with humans or anthros (contrasts anthro) 

adj
  • Internet slang. Engrossed by a certain thought or behavior. 

  • Of or pertaining to the dead, funereal. 

  • Of an animal, being wild but descended from domestic or captive animals. 

  • Wild, untamed. 

  • Contemptible, unruly, misbehaved. 

  • Deadly, fatal. 

mammal

noun
  • An animal of the class Mammalia, characterized by being warm-blooded, having hair and producing milk with which to feed its young. 

  • A vertebrate with three bones in the inner ear and one in the jaw. 

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