roll around vs happen

roll around and happen both are verbs.

Word	Noun	Adjective	Verb	Adverb
roll around	No	No	Yes	No
happen	No	No	Yes	No

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

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

roll around (verb)	happen (verb)
happen regularly	come to pass
	come into being; become reality
	happen, occur, or be the case in the course of events or by chance
	come upon, as if by accident; meet with
	chance to be or do something, without intention or causation