certainty vs suppose

certainty

noun
  • The state of being certain. 

  • A fact or truth unquestionably established. 

  • An instance of being certain. 

suppose

verb
  • To require to exist or to be true; to imply by the laws of thought or of nature. 

  • To put by fraud in the place of another. 

  • To theorize or hypothesize. 

  • To take for granted; to conclude, with less than absolute supporting data; to believe. 

  • To imagine; to believe; to receive as true. 

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