go off vs come about

go off and come about both are verbs.

Word	Noun	Adjective	Verb	Adverb
go off	No	No	Yes	No
come about	No	No	Yes	No

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

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

go off (verb)	come about (verb)
be discharged or activated	come to pass
happen in a particular manner
burst inward
go off or discharge
stop running, functioning, or operating
run away; usually includes taking something or somebody along