centaur vs werewolf

centaur

noun
  • A mythical beast having a horse's body with a man's head and torso in place of the head and neck of the horse. 

  • An icy planetoid that orbits the Sun between Jupiter and Neptune. 

  • A chess-playing team comprising a human player and a computer who work together. 

werewolf

noun
  • A person who is transformed or can transform into a wolf or a wolflike human, often said to transform during a full moon. 

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