moan vs stomachache

moan

noun
  • a low, mournful cry of pain, sorrow or pleasure 

verb
  • To complain; to grumble. 

  • To say in a moan, or with a moaning voice. 

  • To grieve. 

  • To make a moan or similar sound. 

stomachache

noun
  • A pain in the abdomen, often caused by indigestion. (The pain is usually lower than the stomach and related to the intestines.) 

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