black woodpecker vs woodpecker

black woodpecker

noun
  • A bird of the species Dryocopus martius in the family Picidae. 

woodpecker

noun
  • Any bird of species-rich family Picidae, with a strong pointed beak suitable for pecking holes in wood. 

  • Type 92 heavy machine gun 

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