bottlenose dolphin vs orca

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. 

orca

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

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