champion

Adjective

• holding first place in a contest
  • a champion show dog
    
  • a prizewinning wine
    

Noun

• someone who is dazzlingly skilled in any field

• a person who backs a politician or a team etc.
  • all their supporters came out for the game
    
  • they are friends of the library
    

• someone who fights for a cause

• someone who has won first place in a competition

Verb

• protect or fight for as a champion

Related words

• Synonyms: 
  prizewinning , supporter , protagonist , admirer , booster , friend , fighter , hero , paladin , champ , title-holder , defend