woodpecker vs yarrow

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 

yarrow

noun
  • The green woodpecker, Picus viridis. 

  • Common yarrow, Achillea millefolium, the type species of the genus. 

  • Any of several pungent Eurasian and North American herbs, of the genus Achillea, used in traditional herbal medicine. 

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