ophidian vs saurian

ophidian

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

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

saurian

adj
  • Synonym of lizardlike or reptilian. 

  • Of or related to the members of the suborder Sauria. 

noun
  • A reptile of the suborder Sauria. 

  • Any large reptilian animal, including crocodiles and reptilian aliens. 

  • A lizardlike person. 

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