defeater

Noun

Meaning

One who defeats.
defeater of the rebel hordes

(logic, philosophy) a belief which, if proved to be true, would imply outright or indirectly that another belief were false.

Source: en.wiktionary.org

victor conqueror champ mavis captor jailer thrasher winner medallist vanquisher whipper capturer overcomer conquistador subduer

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castaway liberator bummer write off moocher nonstarter

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federate redefeat