bottlenose dolphin vs grampus

bottlenose dolphin

noun
  • Tursiops truncatus, the common bottlenose dolphin, famous for its presence in aquarium shows. 

  • One of the species of gray dolphin in the genus Tursiops, between 2 and 4 meters in length inhabiting warm and temperate seas worldwide. 

grampus

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

  • The hellbender salamander, Cryptobranchus alleganiensis. 

  • The killer whale, Orcinus orca. 

  • giant whip scorpion (Mastigoproctus giganteus) 

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