emit vs bubble

emit is not a noun while bubble is a noun.

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

As verbs, bubble is a hyponym of emit; that is, bubble is a word with a more specific, narrower meaning than emit:

Other hyponyms of emit include belch, burp, eruct, force out, emanate, exhale, give forth, radiate.

emit (noun)	bubble (noun)
	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)

emit (verb)	bubble (verb)
expel (gases or odors)	expel gas from the stomach
express audibly; utter sounds (not necessarily words)	form, produce, or emit bubbles
give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.	cause to form bubbles
	rise in bubbles or as if in bubbles
	flow in an irregular current with a bubbling noise