omasum vs potbelly

omasum

noun
  • The third compartment of the stomach of a ruminant; the lining of said compartment, regarded as a foodstuff. 

potbelly

noun
  • A Vietnamese Pot-bellied pig. 

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

  • A potbelly stove. 

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