avian vs cockerel

avian

noun
  • A bird. 

  • Someone who roleplays or describes themselves as being a bird or bird-like animal character with human characteristics. 

  • A bird-like or flying creature. 

adj
  • Characteristic of or pertaining to birds, or to bird-like or flying creatures. 

cockerel

noun
  • A young male chicken. 

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