retrieval vs retrieve

retrieval is a noun but retrieve is not a noun.

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

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

retrieval (verb)	retrieve (verb)
	recall knowledge from memory; have a recollection
	run after, pick up, and bring to the master
	go for and bring back
	get or find back; recover the use of