discharge vs eruption

discharge and eruption both are nouns.

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

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

discharge: the sudden giving off of energy
eruption: the sudden occurrence of a violent discharge of steam and volcanic material

Other hyponyms of discharge include electrical discharge, blowup, detonation, explosion, volcanic eruption.

discharge (noun)	eruption (noun)
the act of discharging a gun	the sudden occurrence of a violent discharge of steam and volcanic material
the termination of someone's employment (leaving them free to depart)	a sudden very loud noise
a formal written statement of relinquishment	the emergence of a tooth as it breaks through the gum
the act of venting	a sudden violent spontaneous occurrence (usually of some undesirable condition)
the sudden giving off of energy	(of volcanoes) pouring out fumes or lava (or a deposit so formed)
the pouring forth of a fluid	symptom consisting of a breaking out and becoming visible
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)	eruption (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