buzzard vs common raven

buzzard

noun
  • Any scavenging bird, such as the American black vulture (Coragyps atratus) or the turkey vulture (Cathartes aura). 

  • In North America, a curmudgeonly or cantankerous man; an old person; a mean, greedy person. 

  • Any of several Old World birds of prey of the genus Buteo with broad wings and a broad tail. 

  • Synonym of double bogey 

common raven

noun
  • A large all-black passerine bird in the crow family, Corvus corax. 

  • A dark-colored South Asian swallowtail butterfly, Papilio castor 

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