feign vs surmise

feign

verb
  • To imagine; to invent; to pretend to do something. 

  • To hide or conceal. 

  • To make an action as if doing one thing, but actually doing another, for example to trick an opponent; to feint. 

  • To make a false show or pretence of; to counterfeit or simulate. 

surmise

verb
  • To imagine or suspect; to conjecture; to posit with contestable premises. 

noun
  • Thought, imagination, or conjecture, which may be based upon feeble or scanty evidence; suspicion; guess. 

  • Reflection; thought; posit. 

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