discharge vs emission

discharge and emission both are nouns.

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

As nouns, emission is a hypernym of discharge; that is, emission is a word with a broader meaning than discharge:

Other hypernyms of discharge include emanation.

As nouns, discharge and emission are synonyms defined as:

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

Other synonyms of discharge include expelling.

As nouns, discharge and emission are synonyms defined as:

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

discharge (verb)	emission (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