come around vs hap

come around is not a noun while hap is a noun.

Word	Noun	Adjective	Verb	Adverb
come around	No	No	Yes	No
hap	Yes	No	Yes	No

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

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

come around (noun)	hap (noun)
	an accidental happening

come around (verb)	hap (verb)
happen regularly	come to pass
change one's position or opinion