centaur vs leviathan

centaur

noun
  • 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. 

  • 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. 

leviathan

adj
  • Very large; gargantuan. 

noun
  • The political state, especially a domineering and totalitarian one as theorized by Thomas Hobbes. 

  • Something monstrously large or mighty in size, strength, wealth, etc. 

  • A vast sea monster of tremendous strength, described as the most powerful and dangerous creature in the ocean. 

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