alteration vs natural event

alteration and natural event both are nouns.

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

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

alteration: an event that occurs when something passes from one state or phase to another
natural event: an event that happens

Other hypernyms of alteration include happening, occurrence, occurrent.

alteration (noun)	natural event (noun)
the act of revising or altering (involving reconsideration and modification)	an event that happens
the act of making something different (as e.g. the size of a garment)
an event that occurs when something passes from one state or phase to another