emission vs discharge

emission and discharge both are nouns.

Word	Noun	Adjective	Verb	Adverb
emission	Yes	No	No	No
discharge	Yes	No	Yes	No

As nouns, discharge is a hyponym of emission; that is, discharge is a word with a more specific, narrower meaning than emission:

Other hyponyms of emission include radiation, venting.

As nouns, emission and discharge are synonyms defined as:

emission and discharge: any of several bodily processes by which substances go out of the body

Other synonyms of emission include expelling.

As nouns, emission and discharge are synonyms defined as:

emission (noun)	discharge (noun)
the act of emitting; causing to flow forth	the act of discharging a gun
the occurrence of a flow of water (as from a pipe)	the termination of someone's employment (leaving them free to depart)
the release of electrons from parent atoms	a formal written statement of relinquishment
any of several bodily processes by which substances go out of the body	the act of venting
a substance that is emitted or released	the sudden giving off of energy
	the pouring forth of a fluid
	electrical conduction through a gas in an applied electric field
	any of several bodily processes by which substances go out of the body
	a substance that is emitted or released

emission (verb)	discharge (verb)
	eliminate (a substance)
	become empty or void of its content
	pronounce not guilty of criminal charges
	release from military service
	cause to go off
	go off or discharge
	pour forth or release
	remove the charge from
	remove (cargo, people, etc.) from and leave
	complete or carry out
	free from obligations or duties