title-holder vs champion

title-holder and champion both are nouns.

Word	Noun	Adjective	Verb	Adverb
title-holder	Yes	No	No	No
champion	Yes	Yes	Yes	No

As nouns, title-holder and champion are synonyms defined as:

title-holder and champion: someone who has won first place in a competition

Other synonyms of title-holder include champ.

title-holder (noun)	champion (noun)
someone who has won first place in a competition	someone who fights for a cause
	someone who has won first place in a competition
	a person who backs a politician or a team etc.
	someone who is dazzlingly skilled in any field

title-holder (adjective)	champion (adjective)
	holding first place in a contest

title-holder (verb)	champion (verb)
	protect or fight for as a champion