success vs natural event

success and natural event both are nouns.

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

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

Other hypernyms of success include happening, occurrence, occurrent.

success (noun)	natural event (noun)
an attainment that is successful	an event that happens
an event that accomplishes its intended purpose
a person with a record of successes
a state of prosperity or fame