contingency vs occurrence

contingency and occurrence both are nouns.

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

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

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

contingency (noun)	occurrence (noun)
a possible event or occurrence or result	an event that happens
the state of being contingent on something	an instance of something occurring