call up vs call forth

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

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

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

call up: cause to become available for use, either literally or figuratively
call forth: summon into action or bring into existence, often as if by magic

Other hyponyms of call up include arouse, bring up, call down, conjure, conjure up, evoke, invoke, put forward, raise, stir.

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

call up (verb)	call forth (verb)
recall knowledge from memory; have a recollection	summon into action or bring into existence, often as if by magic
get or try to get into communication (with someone) by telephone	evoke or provoke to appear or occur
bring forward for consideration
call to arms; of military personnel
cause to become available for use, either literally or figuratively