make believe vs surmise

make believe

verb
  • To pretend or imagine. 

noun
  • The act of pretending that what is imaginary is real. 

adj
  • imaginary; conjured in someone's imagination, especially when imagined by a child 

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 make believe and surmise occurred in a corpus of books? (source: Google Ngram Viewer )