herptile vs saurian

herptile

noun

  • A reptile or amphibian. 

saurian

noun

  • A reptile of the suborder Sauria. 

  • Any large reptilian animal, including crocodiles and reptilian aliens. 

  • A lizardlike person. 

adj

  • Of or related to the members of the suborder Sauria. 

  • Synonym of lizardlike or reptilian. 

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