daresay vs surmise

daresay

verb
  • Chiefly in the form I daresay: to venture to say (as the speaker believes something is likely to be the case); to think something probable; to presume. 

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