champion

(noun) someone who has won first place in a competition. Synonyms: champ, title-holder.

(noun) someone who fights for a cause. Synonyms: fighter, hero, paladin.

(noun) a person who backs a politician or a team etc.. Synonyms: supporter, protagonist, admirer, booster, friend. Examples: "All their supporters came out for the game." "They are friends of the library."

(noun) someone who is dazzlingly skilled in any field. Synonyms: ace, adept, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz.

(verb) protect or fight for as a champion. Synonyms: defend.

(adj) holding first place in a contest. Synonyms: prizewinning. Examples: "A champion show dog." "A prizewinning wine."