How to Say "weapon" in Spanish
The Spanish word for “weapon” is “arma” — A2 level. This is a very common word in everyday Spanish.

Examples
El soldado llevaba un arma para protegerse.
The soldier carried a weapon to protect himself.
La policía encontró el arma del crimen en el parque.
The police found the murder weapon in the park.
Tener un arma de fuego requiere una licencia especial.
Having a firearm requires a special license.
The 'el arma' Rule
Even though 'arma' is a feminine word (meaning you'd say 'las armas' for plural), we use 'el' in the singular ('el arma'). This is just to make it sound better and avoid the two 'a' sounds running together in 'la arma'. This happens with other feminine words that start with a stressed 'a' sound, like 'agua' ('el agua').
Using 'la' instead of 'el'
Mistake: “Vi la arma en la mesa.”
Correction: Vi el arma en la mesa. Remember, for singular feminine nouns starting with a stressed 'a', we borrow 'el' to make it flow nicely. But if you add an adjective, it goes back to 'la'! For example: 'la potente arma' (the powerful weapon).
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