mantis vs soothsayer

mantis

noun
  • A green colour, like that of many mantises. 

  • Any of various large insects of the order Mantodea that catch insects or other small animals with their powerful forelegs. 

soothsayer

noun
  • A mantis or rearhorse. 

  • One who predicts the future, using magic, intuition or intelligence; a diviner. 

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