retrieval vs delivery

retrieval and delivery both are nouns.

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

As nouns, delivery is a hyponym of retrieval; that is, delivery 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)
delivery: recovery or preservation from loss or danger

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

retrieval (noun)	delivery (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	the voluntary transfer of something (title or possession) from one party to another
(computer science) the operation of accessing information from the computer's memory	the act of delivering a child
	the act of throwing a baseball or softball by the pitcher towards home plate, which initiates play by giving the batter a chance to hit it
	the act of delivering or distributing something (as goods or mail)
	your characteristic style or manner of expressing yourself orally
	the event of giving birth