alteration vs occurrent

alteration and occurrent both are nouns.

Word	Noun	Adjective	Verb	Adverb
alteration	Yes	No	No	No
occurrent	Yes	Yes	No	No

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

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

Other hypernyms of alteration include happening, natural event, occurrence.

alteration (noun)	occurrent (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

alteration (adjective)	occurrent (adjective)
	presently occurring (either causally or incidentally)