give back vs repay

give back and repay both are verbs.

Word	Noun	Adjective	Verb	Adverb
give back	No	No	Yes	No
repay	No	No	Yes	No

As verbs, give back and repay are synonyms defined as:

Other synonyms of give back include refund, return.

give back (verb)	repay (verb)
pay back	answer back
	pay back
	make repayment for or return something
	act or give recompense in recognition of someone's behavior or actions