Definitions of champion:

• noun:   someone who fights for a cause
• noun:   someone who has won first place in a competition
• noun:   someone who is dazzlingly skilled in any field
• noun:   a person who backs a politician or a team etc.
• verb:   protect or fight for as a champion
• adjective:   holding first place in a contest

  Example: "A champion show dog"

• name:  A surname (common: 1 in 14285 families; popularity rank in the U.S.: #1899)