heed vs rumination

heed

noun
  • Careful attention. 

verb
  • To mind; to regard with care; to take notice of; to attend to; to observe. 

rumination

noun
  • Deep thought or consideration. 

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

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

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

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