come back vs refer

come back and refer both are verbs.

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

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

Other hypernyms of come back include denote.

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