chance event vs natural event

chance event and natural event both are nouns.

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

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

chance event: anything that happens suddenly or by chance without an apparent cause
natural event: an event that happens

Other hypernyms of chance event include happening, occurrence, occurrent.

chance event (noun)	natural event (noun)
anything that happens suddenly or by chance without an apparent cause	an event that happens