[n] someone who fights for a cause
[n] someone who has won first place in a competition
[n] a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library"
[adj] holding first place in a contest; "a champion show dog"; "a prizewinning wine"
[adj] clearly superior or having the attributes of a winner; "a champion at teaching"
[v] protect or fight for as a champion
admirer, best, booster, champ, defend, fighter, friend, hero, paladin, prizewinning, protagonist, superior, supporter, title-holder