milfoil vs popinjay

milfoil

noun
  • Common yarrow, Achillea millefolium. 

  • Any of several similar pungent Eurasian herbs, of the genus Achillea 

  • Any plants of the genus Myriophyllum; water milfoil. 

popinjay

noun
  • The green woodpecker, Picus viridis. 

  • A parrot. 

  • A target to shoot at, typically stuffed with feathers or plumage. 

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