Nouns

(n)dischargethe sudden giving off of energy
(n)discharge, ventingthe act of venting
(n)discharge, emissiona substance that is emitted or released
(n)discharge, emission, expellingany of several bodily processes by which substances go out of the body“the discharge of pus”
(n)discharge, spark, arc, electric arc, electric dischargeelectrical conduction through a gas in an applied electric field
(n)discharge, outpouring, runthe pouring forth of a fluid
(n)dismissal, dismission, discharge, firing, liberation, release, sack, sackingthe termination of someone's employment (leaving them free to depart)
(n)release, waiver, dischargea formal written statement of relinquishment
(n)discharge, firing, firing offthe act of discharging a gun

Verbs

(v)dispatch, discharge, completecomplete or carry out“discharge one's duties”
(v)dischargepour forth or release“discharge liquids”
(v)free, dischargefree from obligations or duties
(v)dischargeremove the charge from
(v)fire, discharge, go offgo off or discharge“The gun fired”
(v)acquit, assoil, clear, discharge, exonerate, exculpatepronounce not guilty of criminal charges“The suspect was cleared of the murder charges”
(v)exhaust, discharge, expel, eject, releaseeliminate (a substance)“combustion products are exhausted in the engine”, “the plant releases a gas”
(v)drop, drop off, set down, put down, unload, dischargeremove (cargo, people, etc.) from and leave“unload the cargo”, “drop off the passengers at the hotel”
(v)fire, dischargecause to go off“fire a gun”, “fire a bullet”
(v)discharge, muster outrelease from military service
(v)empty, dischargebecome empty or void of its content“The room emptied”