record-breaker vs champion

record-breaker and champion both are nouns.

Word	Noun	Adjective	Verb	Adverb
record-breaker	Yes	No	No	No
champion	Yes	Yes	Yes	No

As nouns, champion is a hypernym of record-breaker; that is, champion is a word with a broader meaning than record-breaker:

Other hypernyms of record-breaker include champ, title-holder.

record-breaker (noun)	champion (noun)
someone who breaks a record	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

record-breaker (adjective)	champion (adjective)
	holding first place in a contest

record-breaker (verb)	champion (verb)
	protect or fight for as a champion