How to Say "assailant" in Spanish
The Spanish word for “assailant” is “atacante” — B1 level. This is a very common word in everyday Spanish.

Examples
La policía logró detener al atacante antes de que escapara.
The police managed to catch the attacker before they escaped.
Es difícil defenderse de un atacante invisible como un virus.
It's hard to defend yourself against an invisible attacker like a virus.
La víctima no pudo identificar a su atacante.
The victim couldn't identify their attacker.
One word, two genders
This word ends in -e, which means it doesn't change its spelling for men or women. Use 'el atacante' for a man and 'la atacante' for a woman.
Using it as a descriptor
While usually a noun (a person), you can place it after another noun to describe it, like 'un perro atacante' (an attacking dog).
The 'atacanta' error
Mistake: “Using 'la atacanta' to refer to a female attacker.”
Correction: Always use 'la atacante'. Words ending in -ante almost never change to -anta.
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