anguine vs viperine

anguine

adj

  • Pertaining to snakes or serpents 

  • Snakelike. 

viperine

adj

  • Of, relating to or resembling a viper 

noun

  • Any viper of the subfamily Viperinae 

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