cud vs rumination

cud

noun
  • The portion of food which is brought back into the mouth by ruminating animals from their first stomach, to be chewed a second time. 

verb
  • To bring back into the mouth and chew a second time. 

rumination

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

  • Deep thought or consideration. 

  • 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 cud and rumination occurred in a corpus of books? (source: Google Ngram Viewer )