common raven vs sable

common raven

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

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

sable

noun
  • A dark brown colour, resembling the fur of some sables. 

  • Black garments, especially worn in mourning. 

  • The sablefish. 

  • An artist's brush made from the fur of the sable (Wikipedia). 

  • The fur or pelt of the sable or other species of martens; a coat made from this fur. 

  • A small carnivorous mammal of the Old World that resembles a weasel, Martes zibellina, from cold regions in Eurasia and the North Pacific islands, valued for its dark brown fur (Wikipedia). 

  • The marten, especially Martes americana (syn. Mustela americana). 

  • A black colour on a coat of arms (Wikipedia). 

adj
  • Of the black colour sable. 

  • Dark, somber. 

  • Made of sable fur. 

  • In blazon, of the colour black. 

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