世せ界かい王おう者じゃ

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Meanings

1

noun

world champion

Refers to the titleholder of a world championship in sports, games, or competitions.

チャンピオン
A more general loanword for 'champion', not necessarily specifying 'world' level.
王おう者じゃ
Means 'champion' or 'king' in a broader sense; 世界王者 explicitly adds 'world' scope.

Compound of 世界 (world) and 王者 (champion, ruler).