recur vs come back

recur and come back both are verbs.

Word	Noun	Adjective	Verb	Adverb
recur	No	No	Yes	No
come back	No	No	Yes	No

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

Other hypernyms of recur include hark back, recall, return.

recur (verb)	come back (verb)
happen or occur again	be restored
return in thought or speech to something	go back to something earlier
have recourse to	answer back
	even the score, in sports