call back vs refresh

call back and refresh both are verbs.

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

As verbs, refresh is a hyponym of call back; that is, refresh is a word with a more specific, narrower meaning than call back:

Other hyponyms of call back include know, recognise, recognize, brush up, review.

call back (verb)	refresh (verb)
recall knowledge from memory; have a recollection	make fresh again
summon to return	become or make oneself fresh again
return or repeat a telephone call	make (to feel) fresh
cause to be returned	refresh one's memory