ophidian vs plumbing 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. 

plumbing snake

noun

  • Synonym of plumber's snake 

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