crocodilian vs herptile

crocodilian

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

adj
  • of, pertaining to, or resembling crocodiles 

herptile

noun
  • A reptile or amphibian. 

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