birdman vs pilot burner

birdman

noun
  • an aviator. 

  • A man who works with birds. 

  • A mythological creature that is part man and part bird. 

pilot burner

noun
  • Synonym of pilot light (“persistent flame to ignite gas”) 

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