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Synonyms for Belch (same or very similar meaning)

WordNet sense 1 (become active and spew forth lava and rocks):
erupt, extravasate

WordNet sense 2 (a reflex that expels wind noisily from the stomach through the mouth):
burp, eructation, belching, burping

WordNet sense 3 (expel gas from the stomach):
bubble, eruct

From the ODE community, based on WordNetadd/edit