omasum vs tummy

omasum

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

tummy

noun
  • Protruding belly, paunch. 

  • A woman's uterus, especially in reference to where a baby is carried. 

  • Stomach or belly. 

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