bellyache vs tummyache

bellyache

noun

  • Any pain in the belly, stomach, or abdomen. 

verb

  • To unnecessarily complain or whine, often about simple matters. 

tummyache

noun

  • Any pain in the stomach or abdomen. 

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