What's the main difference between a "champion" and a "winner?"

Native speaker’s answer
Rebecca
A "winner" is more of a broader term than "champion" - it is someone who has won something or often wins. A "champion" is a winner of a contest against rivals, usually a sports contest or another activity. Ex: He's the boxing champion of the world. Ex: She's a Nobel Peace prize winner. Ex: The winner will get a prize.