ophidian vs reptiloid

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. 

reptiloid

noun

  • A reptilian humanoid creature. 

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