Hydra vs Snake

Hydra

name
  • A mythological serpent with many heads, slain by Hercules as one of his twelve labours. 

  • One of the Saronic Islands in the Aegean Sea. 

  • A spring constellation of the northern sky, said to resemble a serpent. It lies just south of the zodiac and contains the star Alphard. 

  • One of Pluto's moons. 

Snake

name
  • An early computer game, later popular on mobile phones, in which the player attempts to manoeuvre a perpetually growing snake so as to collect food items and avoid colliding with walls or the snake's tail. 

  • A surname. 

  • The sixth of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. 

  • A river in the northwestern United States, tributary to the Columbia 

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