come off vs come about

come off and come about both are verbs.

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

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

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

come off (verb)	come about (verb)
happen in a particular manner	come to pass
come to be detached
break off (a piece from a whole)