anguiform vs ophidian

anguiform

adj

  • Shaped like a snake. 

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. 

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