chance event vs hap

chance event and hap both are nouns.

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

As nouns, hap is a hyponym of chance event; that is, hap is a word with a more specific, narrower meaning than chance event:

chance event: anything that happens suddenly or by chance without an apparent cause
hap: an accidental happening

Other hyponyms of chance event include break, good luck, happy chance, coincidence, happenstance, lottery.

chance event (noun)	hap (noun)
anything that happens suddenly or by chance without an apparent cause	an accidental happening

chance event (verb)	hap (verb)
	come to pass