come back vs return

come back is not a noun while return is a noun.

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

As verbs, come back and return are synonyms defined as:

As verbs, come back and return are synonyms defined as:

Other synonyms of come back include hark back, recall.

As verbs, come back and return are synonyms defined as:

Other synonyms of come back include rejoin, repay, retort, riposte.

come back (noun)	return (noun)
	the act of going back to a prior location
	a coming to or returning home
	getting something back again
	a tennis stroke that sends the ball back to the other player
	(American football) the act of running back the ball after a kickoff or punt or interception or fumble
	a reciprocal group action
	the act of someone appearing again
	the key on electric typewriters or computer keyboards that causes a carriage return and a line feed
	document giving the tax collector information about the taxpayer's tax liability
	a quick reply to a question or remark (especially a witty or critical one)
	happening again (especially at regular intervals)
	the occurrence of a change in direction back in the opposite direction
	the income or profit arising from such transactions as the sale of land or other property

come back (verb)	return (verb)
be restored	go back to a previous state
go back to something earlier	be restored
answer back	go back to something earlier
even the score, in sports	answer back
	submit (a report, etc.) to someone in authority
	pass down
	make a return
	give or supply
	go or come back to place, condition, or activity where one has been before
	return to a previous position; in mathematics
	bring back to the point of departure
	pay back
	return in kind
	give back
	be inherited by
	elect again