champion vs protector

champion and protector both are nouns.

Word	Noun	Adjective	Verb	Adverb
champion	Yes	Yes	Yes	No
protector	Yes	No	No	No

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

Other hypernyms of champion include defender, guardian, shielder.

champion (noun)	protector (noun)
someone who fights for a cause	a person who cares for persons or property
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

champion (adjective)	protector (adjective)
holding first place in a contest

champion (verb)	protector (verb)
protect or fight for as a champion