call back vs retrieve

call back and retrieve both are verbs.

Word	Noun	Adjective	Verb	Adverb
call back	No	No	Yes	No
retrieve	No	No	Yes	No

As verbs, call back and retrieve are synonyms defined as:

call back and retrieve: recall knowledge from memory; have a recollection

Other synonyms of call back include call up, recall, recollect, remember, think.

call back (verb)	retrieve (verb)
recall knowledge from memory; have a recollection	recall knowledge from memory; have a recollection
summon to return	run after, pick up, and bring to the master
return or repeat a telephone call	go for and bring back
cause to be returned	get or find back; recover the use of