eructation vs belch

eructation and belch both are nouns.

Word	Noun	Adjective	Verb	Adverb
eructation	Yes	No	No	No
belch	Yes	No	Yes	No

As nouns, eructation and belch are synonyms defined as:

eructation and belch: a reflex that expels gas noisily from the stomach through the mouth

Other synonyms of eructation include belching, burp, burping.

eructation (noun)	belch (noun)
a reflex that expels gas noisily from the stomach through the mouth	a reflex that expels gas noisily from the stomach through the mouth
(of volcanoes) pouring out fumes or lava (or a deposit so formed)

eructation (verb)	belch (verb)
	expel gas from the stomach
	become active and spew forth lava and rocks