Similar Words to Champion:

Ace
Adept
Admirer
Booster
Champ
Defend
Fighter
Friend
Genius
Hero
Hotshot
Maven
Mavin
Paladin
Prizewinning
Protagonist
Sensation
Star
Superstar
Supporter
Title-holder
Virtuoso
Whiz
Whizz
Wiz
Wizard

Examples:

1. How does it feel to live with the boxing champion of the world?

Definitions of Champion:

1. Someone who has won first place in a competition
2. Someone who fights for a cause
3. A person who backs a politician or a team etc.
4. Someone who is dazzlingly skilled in any field
5. Protect or fight for as a champion
6. Holding first place in a contest