Centaur vs battle axe

Centaur

noun
  • A skillful horseman or horsewoman. 

  • 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 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 

battle axe

noun
  • An ancient military weapon, an axe designed for combat, including (in heraldry) when borne on arms as a mark of prowess. 

  • A domineering, antagonistic woman. 

  • An allotment of land at the rear of another property, with a long, narrow strip of land connecting it to the roadway. 

  • An electric guitar. 

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