go back vs rebound

go back is not a noun while rebound is a noun.

Word	Noun	Adjective	Verb	Adverb
go back	No	No	Yes	No
rebound	Yes	No	Yes	No

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

Other hyponyms of go back include rally.

go back (noun)	rebound (noun)
	the act of securing possession of the rebounding basketball after a missed shot
	a reaction to a crisis or setback or frustration
	a movement back from an impact

go back (verb)	rebound (verb)
regain a former condition after a financial loss	return to a former condition
return in thought or speech to something	spring back; spring away from an impact
belong to an earlier time