loser; the defeated
Refers to a person who has been defeated in a contest, battle, or competition. Often carries a nuance of finality or disgrace, contrasting with 勝利者 (winner).
Antonyms: 勝利者
彼は試合に負けて敗北者となった。
He lost the match and became the loser.
歴史は敗北者によって書かれることはない。
History is not written by the defeated.
winner; victor
Compound of 敗北 (defeat) + 者 (person). The exact historical derivation is uncertain, but the word follows a common pattern for forming agent nouns.