guesswork vs inference

guesswork

noun
  • An estimate, judgment or opinion made by guessing, from limited information. 

inference

noun
  • That which is inferred; a truth or proposition drawn from another which is admitted or supposed to be true; a conclusion; a deduction. 

  • The act or process of inferring by deduction or induction. 

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