call up vs mobilize

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

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

As verbs, call up and mobilize are synonyms defined as:

Other synonyms of call up include mobilise, rally.

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

call up (verb)	mobilize (verb)
recall knowledge from memory; have a recollection	cause to move around
get or try to get into communication (with someone) by telephone	make ready for action or use
bring forward for consideration	get ready for war
call to arms; of military personnel	call to arms; of military personnel
cause to become available for use, either literally or figuratively