brainstorm vs ruminate

brainstorm

verb
  • To participate in a brainstorming session. 

  • To investigate something, or solve a problem using brainstorming. 

noun
  • A sudden thought, particularly one that solves a long-standing problem. 

  • A session of brainstorming, investigating a problem to try to find solutions. 

  • An unexpected mental error. 

ruminate

verb
  • To meditate or ponder over; to muse on. 

  • To meditate or reflect. 

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

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

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