burp vs bubble

burp and bubble both are nouns.

Word	Noun	Adjective	Verb	Adverb
burp	Yes	No	Yes	No
bubble	Yes	No	Yes	No

As verbs, burp and bubble are synonyms defined as:

Other synonyms of burp include belch, eruct.

burp (noun)	bubble (noun)
a reflex that expels gas noisily from the stomach through the mouth	a dome-shaped covering made of transparent glass or plastic
	an impracticable and illusory idea
	a speculative scheme that depends on unstable factors that the planner cannot control
	a hollow globule of gas (e.g., air or carbon dioxide)

burp (verb)	bubble (verb)
expel gas from the stomach	expel gas from the stomach
	form, produce, or emit bubbles
	cause to form bubbles
	rise in bubbles or as if in bubbles
	flow in an irregular current with a bubbling noise