gut vs internal organ

gut

noun
  • The alimentary canal, especially the intestine. 

  • A narrow passage of water. 

  • A class that is not demanding or challenging. 

  • The intestines of an animal used to make strings of a tennis racket or violin, etc. 

  • The abdomen of a person, especially one that is enlarged 

  • A person's emotional, visceral self. 

  • The sac of silk taken from a silkworm when ready to spin its cocoon, for the purpose of drawing it out into a thread. When dry, it is exceedingly strong, and is used as the snood of a fishing line. 

verb
  • To dishearten; to crush (the spirits of). 

  • To eviscerate. 

  • To remove or destroy the most important parts of. 

adj
  • Instinctive. 

  • Made of gut. 

internal organ

noun
  • An organ, such as the heart or colon, that is entirely within the confines of the body. 

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