buyback vs redemption

buyback and redemption both are nouns.

Word	Noun	Adjective	Verb	Adverb
buyback	Yes	No	No	No
redemption	Yes	No	No	No

As nouns, buyback and redemption are synonyms defined as:

buyback and redemption: the act of purchasing back something previously sold

Other synonyms of buyback include repurchase.

buyback (noun)	redemption (noun)
the act of purchasing back something previously sold	the act of purchasing back something previously sold
	(theology) the act of delivering from sin or saving from evil
	repayment of the principal amount of a debt or security at or before maturity (as when a corporation repurchases its own stock)