2. (noun)champion, fighter, hero, paladin someone who fights for a cause
3. (noun)supporter, protagonist, champion, admirer, booster, friend a person who backs a politician or a team etc.
"all their supporters came out for the game"; "they are friends of the library"
4. (noun)ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz someone who is dazzlingly skilled in any field
5. (adj)champion, prizewinning holdingfirstplace in a contest "a champion show dog"; "a prizewinning wine"
6. (verb)champion, defend protect or fight for as a champion
Definitions of 'champion':
