go on vs hap

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

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

As verbs, go on and hap are synonyms defined as:

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

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

go on (verb)	hap (verb)
come to pass	come to pass
continue talking
start running, functioning, or operating
move forward, also in the metaphorical sense
continue a certain state, condition, or activity