ruminate vs speculate

ruminate

adj
  • Having a hard albumen penetrated by irregular channels filled with softer matter, as the nutmeg and the seeds of the North American papaw. 

verb
  • To meditate or reflect. 

  • To meditate or ponder over; to muse on. 

  • To chew cud. (Said of ruminants.) Involves regurgitating partially digested food from the rumen. 

speculate

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

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

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

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