deduce vs speculate

deduce

verb
  • To reach (a conclusion) by applying rules of logic or other forms of reasoning to given premises or known facts. 

  • To examine, explain, or record (something) in an orderly manner. 

speculate

verb
  • To make an inference based on inconclusive evidence; to surmise or conjecture. 

  • To make a risky trade in the hope of making a profit; to venture or gamble. 

  • To anticipate which branch of code will be chosen and execute it in advance. 

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