champion - noun

someone who has won first place in a competition

someone who fights for a cause

a person who backs a politician or a team etc.

someone who is dazzlingly skilled in any field

champion - verb

• protect or fight for as a champion

champion - adjective

• holding first place in a contest

champion - thesaurus

ace   adept   admirer   booster   champ   defend   fighter   friend   genius   hero   hotshot   maven   mavin   paladin   prizewinning   protagonist   sensation   star   superstar   supporter   virtuoso   whiz   whizz   wiz   wizard