refresh vs call up

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

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

As verbs, call up is a hypernym of refresh; that is, call up is a word with a broader meaning than refresh:

Other hypernyms of refresh include call back, recall, recollect, remember, retrieve, think.

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

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