Synonyms for Belch (same or very similar meaning)
WordNet sense 1 (become active and spew forth lava and rocks):
erupt, extravasateWordNet sense 2 (a reflex that expels wind noisily from the stomach through the mouth):
burp, eructation, belching, burpingWordNet sense 3 (expel gas from the stomach):
bubble, eructFrom the ODE community, based on WordNetadd/edit