grampus vs orca

grampus

noun
  • The killer whale, Orcinus orca. 

  • The hellbender salamander, Cryptobranchus alleganiensis. 

  • Risso's dolphin, Grampus griseus, with a blunt nose. 

  • giant whip scorpion (Mastigoproctus giganteus) 

orca

noun
  • A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly called the killer whale. 

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