hap vs chance event

hap and chance event both are nouns.

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

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

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

Other hypernyms of hap include accident, fortuity, stroke.

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

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