How to Say "avenger" in Spanish
The Spanish word for “avenger” is “vengador” — B2 level.

Examples
Él se presentó como el vengador de los inocentes.
He presented himself as the avenger of the innocent.
La película de 'Los Vengadores' es muy popular en todo el mundo.
The 'Avengers' movie is very popular all over the world.
El pueblo esperaba a un vengador que terminara con la injusticia.
The town was waiting for an avenger to end the injustice.
Adding an 'a' for women
To talk about a female avenger, simply change the ending to 'vengadora'. This follows the standard rule for words ending in a consonant: add an 'a' for feminine forms.
The 'Avenging' Adjective
This word also works as a descriptive word (adjective). When it describes a thing, it must match that thing in gender: 'una espada vengadora' (an avenging sword).
Vengador vs. Vengativo
Mistake: “Soy una persona muy vengador.”
Correction: Soy una persona muy vengativa.
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