clarify vs surmise

clarify

verb
  • To make clear or easily understood; to explain in order to remove doubt or obscurity. 

  • To grow clear or bright; to clear up. 

  • To grow or become clear or transparent; to become free from feculent impurities, as wine or other liquid under clarification. 

  • To make clear or bright by freeing from feculent matter. 

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