send for vs call up

send for is not a noun while call up is a noun.

Word	Noun	Adjective	Verb	Adverb
send for	No	No	Yes	No
call up	Yes	No	Yes	No

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

Other hyponyms of send for include cite, summon, summons, beep, call back, recall, call in, lift, muster, hail, summon, mobilise, mobilize, rally.

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

send for (verb)	call up (verb)
order, request, or command to come	recall knowledge from memory; have a recollection
	get or try to get into communication (with someone) by telephone
	bring forward for consideration
	call to arms; of military personnel
	cause to become available for use, either literally or figuratively