call up vs refresh

call up is a noun but refresh is not a noun.

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

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

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

call up (noun)	refresh (noun)
an order to report for military duty

call up (verb)	refresh (verb)
recall knowledge from memory; have a recollection	make fresh again
get or try to get into communication (with someone) by telephone	become or make oneself fresh again
bring forward for consideration	make (to feel) fresh
call to arms; of military personnel	refresh one's memory
cause to become available for use, either literally or figuratively