refer vs come back

refer and come back both are verbs.

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

As verbs, come back is a hyponym of refer; that is, come back is a word with a more specific, narrower meaning than refer:

refer (verb)	come back (verb)
think of, regard, or classify under a subsuming principle or with a general group or in relation to another	be restored
have as a meaning	go back to something earlier
make reference to	answer back
use a name to designate	even the score, in sports
seek information from
send or direct for treatment, information, or a decision
be relevant to