brooding vs rumination

brooding

noun
  • A spell of brooding; the time when someone broods. 

adj
  • Broody; incubating eggs by sitting on them. 

  • Deeply or seriously thoughtful. 

rumination

noun
  • Negative cyclic thinking; persistent and recurrent worrying or brooding. 

  • Deep thought or consideration. 

  • The act of ruminating; i.e. chewing cud. 

  • An eating disorder characterized by repetitive regurgitation of small amounts of food from the stomach. 

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