retrieval vs rescue

retrieval and rescue both are nouns.

Word	Noun	Adjective	Verb	Adverb
retrieval	Yes	No	No	No
rescue	Yes	No	Yes	No

As nouns, rescue is a hyponym of retrieval; that is, rescue is a word with a more specific, narrower meaning than retrieval:

retrieval: the act of regaining or saving something lost (or in danger of becoming lost)
rescue: recovery or preservation from loss or danger

Other hyponyms of retrieval include repossession, reclamation, deliverance, delivery, saving, ransom, recapture, retaking.

retrieval (noun)	rescue (noun)
the act of regaining or saving something lost (or in danger of becoming lost)	recovery or preservation from loss or danger
the cognitive operation of accessing information in memory
(computer science) the operation of accessing information from the computer's memory

retrieval (verb)	rescue (verb)
	take forcibly from legal custody
	free from harm or evil