Polish vs birdfeed

Polish

noun
  • A breed of chickens with a large crest of feathers. 

  • The language spoken in Poland. 

adj
  • Of, from or native to Poland, or relating to the Polish language. 

birdfeed

noun
  • Food intended for birds, often a mixture of various seeds. 

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