Centaur vs leviathan

Centaur

noun
  • One of a race of monsters having a head, torso, and arms of a man, and the body and legs of a horse. Often depicted as rowdy drunkards, with Chiron being a notable exception. 

  • A skillful horseman or horsewoman. 

  • A U.S. upper stage, with a restartable liquid-propellant engine, used with an Atlas or Titan booster to launch satellites and probes. 

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

leviathan

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

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

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

adj
  • Very large; gargantuan. 

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