go off vs occur

go off and occur both are verbs.

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

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

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

go off (verb)	occur (verb)
be discharged or activated	come to pass
happen in a particular manner	come to one's mind; suggest itself
burst inward	to be found to exist
go off or discharge
stop running, functioning, or operating
run away; usually includes taking something or somebody along