rescue vs retrieval

rescue and retrieval both are nouns.

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

As nouns, retrieval is a hypernym of rescue; that is, retrieval is a word with a broader meaning than rescue:

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

Other hypernyms of rescue include recovery.

rescue (noun)	retrieval (noun)
recovery or preservation from loss or danger	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

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