go over vs hap

go over is not a noun while hap is a noun.

Word	Noun	Adjective	Verb	Adverb
go over	No	No	Yes	No
hap	Yes	No	Yes	No

As verbs, hap is a hypernym of go over; that is, hap is a word with a broader meaning than go over:

Other hypernyms of go over include come about, fall out, go on, happen, occur, pass, pass off, take place.

go over (noun)	hap (noun)
	an accidental happening

go over (verb)	hap (verb)
fall forward and down	come to pass
happen in a particular manner
hold a review (of troops)
examine so as to determine accuracy, quality, or condition