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

Examples
El asesinato del político provocó una crisis nacional.
The assassination of the politician caused a national crisis.
La policía está investigando el brutal asesinato.
The police are investigating the brutal murder.
Fue condenado por intento de asesinato.
He was convicted of attempted murder.
Always Masculine
Like most Spanish nouns that end in '-o', 'asesinato' is masculine. This means you'll always use masculine words like 'el' or 'un' before it: 'el asesinato', 'un asesinato'.
'Asesinato' vs. 'Homicidio'
Mistake: “Using 'asesinato' for any and every killing.”
Correction: In legal terms, 'asesinato' implies premeditation or taking advantage of the victim's defenselessness (it's a planned or particularly cruel murder). 'Homicidio' is the general term for killing another person (homicide), which may or may not be planned.
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