caller-up vs caller

caller-up and caller both are nouns.

Word	Noun	Adjective	Verb	Adverb
caller-up	Yes	No	No	No
caller	Yes	Yes	No	No

As nouns, caller-up and caller are synonyms defined as:

Other synonyms of caller-up include phoner, telephoner.

caller-up (noun)	caller (noun)
the person initiating a telephone call	a social or business visitor
	the person initiating a telephone call
	the person who convenes a meeting
	someone who proclaims or summons in a loud voice
	a person who announces the changes of steps during a dance
	the bettor in a card game who matches the bet and calls for a show of hands
	an investor who buys a call option

caller-up (adjective)	caller (adjective)
	providing coolness
	fresh