appraise vs surmise

appraise

verb
  • To estimate; to conjecture. 

  • To consider comprehensively. 

  • To apprise, inform. 

  • To determine the value or worth of (something), particularly as a person appointed for this purpose. 

  • To judge the performance of someone, especially a worker. 

  • To praise; to commend. 

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