burp vs emit

burp is a noun but emit is not a noun.

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

As verbs, emit is a hypernym of burp; that is, emit is a word with a broader meaning than burp:

Other hypernyms of burp include breathe, pass off.

burp (noun)	emit (noun)
a reflex that expels gas noisily from the stomach through the mouth

burp (verb)	emit (verb)
expel gas from the stomach	expel (gases or odors)
	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.