belch vs burp

belch

verb
  • To expel (gas) loudly from the stomach through the mouth. 

  • To eject or emit (something) with spasmodic force or noise. 

noun
  • The sound one makes when belching. 

burp

verb
  • To open (a container of fermenting substance) to allow the release of accumulated gas. 

  • To cause someone (such as a baby) to burp. 

  • To utter by burping 

  • To emit a burp. 

noun
  • A belch. 

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