ophidian vs pipe snake

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. 

pipe snake

noun
  • Shieldtail snake, family Uropeltidae. 

  • Synonym of plumber's snake 

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