birdman vs rocket scientist

birdman

noun
  • an aviator. 

  • A man who works with birds. 

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

rocket scientist

noun
  • An aerospace engineer. 

  • One qualified to handle or understand things which are very complex or confusing; a very intelligent person. 

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