colubrine vs crocodilian

colubrine

adj
  • Relating to snakes. 

  • Snakelike. 

noun
  • Any snake of the subfamily Colubrinae 

crocodilian

adj
  • of, pertaining to, or resembling crocodiles 

noun
  • Any reptile of the order Crocodilia; a crocodile, alligator, caiman or gavial. 

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