beaked whale vs bottlenose dolphin

beaked whale

noun
  • Any of at least 20 species of whales in the family Ziphiidae, known to dive to great depths. 

bottlenose dolphin

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

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

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