contingency vs happening

contingency and happening both are nouns.

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

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

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

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