ransom vs redeem

ransom is a noun but redeem is not a noun.

Word	Noun	Adjective	Verb	Adverb
ransom	Yes	No	Yes	No
redeem	No	No	Yes	No

As verbs, ransom and redeem are synonyms defined as:

ransom (noun)	redeem (noun)
the act of freeing from captivity or punishment
payment for the release of someone
money demanded for the return of a captured person

ransom (verb)	redeem (verb)
exchange or buy back for money; under threat	convert into cash; of commercial papers
	pay off (loans or promissory notes)
	exchange or buy back for money; under threat
	to turn in (vouchers or coupons) and receive something in exchange
	restore the honor or worth of
	save from sins