abdominal cavity vs tummy

abdominal cavity

noun
  • The hollow portion of the torso within the abdomen, containing the abdominal organs, in mammals below the diaphragm. 

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 abdominal cavity and tummy occurred in a corpus of books? (source: Google Ngram Viewer )