go off vs happen

go off and happen both are verbs.

Word	Noun	Adjective	Verb	Adverb
go off	No	No	Yes	No
happen	No	No	Yes	No

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

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

go off (verb)	happen (verb)
be discharged or activated	come to pass
happen in a particular manner	come into being; become reality
burst inward	happen, occur, or be the case in the course of events or by chance
go off or discharge	come upon, as if by accident; meet with
stop running, functioning, or operating	chance to be or do something, without intention or causation
run away; usually includes taking something or somebody along