crocodilian vs ophidian

crocodilian

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

adj
  • of, pertaining to, or resembling crocodiles 

ophidian

noun
  • Any species of the suborder Serpentes; a snake or serpent. 

adj
  • Of or pertaining to the suborder Serpentes; of, related to, or characteristic of a snake or serpent. 

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