innard vs potbelly

innard

noun
  • Entrail; gut; intestine. 

potbelly

noun
  • A large, swollen, or protruding abdomen; a paunch. 

  • A potbelly stove. 

  • A Vietnamese Pot-bellied pig. 

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