eruption vs natural event

eruption and natural event both are nouns.

Word	Noun	Adjective	Verb	Adverb
eruption	Yes	No	No	No
natural event	Yes	No	No	No

As nouns, natural event is a hypernym of eruption; that is, natural event is a word with a broader meaning than eruption:

eruption: a sudden violent spontaneous occurrence (usually of some undesirable condition)
natural event: an event that happens

Other hypernyms of eruption include happening, occurrence, occurrent.

eruption (noun)	natural event (noun)
the sudden occurrence of a violent discharge of steam and volcanic material	an event that happens
a sudden very loud noise
the emergence of a tooth as it breaks through the gum
a sudden violent spontaneous occurrence (usually of some undesirable condition)
(of volcanoes) pouring out fumes or lava (or a deposit so formed)
symptom consisting of a breaking out and becoming visible