success vs occurrence

success and occurrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
success	Yes	No	No	No
occurrence	Yes	No	No	No

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

Other hypernyms of success include happening, natural event, occurrent.

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