How to Say "crux" in Spanish
The most common Spanish word for “crux” is “clave” — use 'clave' when referring to the most important or decisive element needed to understand or solve something..
clave
KLAH-veh/ˈklaβe/

Examples
La clave del éxito en este proyecto es la comunicación efectiva.
The key to success in this project is effective communication.
La clave para resolver este problema es la paciencia.
The key to solving this problem is patience.
Su testimonio fue la clave del caso.
His testimony was the key to the case.
cruz
/krooz//kɾuθ/

Examples
El punto crucial de su argumento fue la falta de evidencia.
The crucial point of his argument was the lack of evidence.
Dibujó una cruz en el mapa para marcar el tesoro.
He drew a cross on the map to mark the treasure.
El símbolo de la Cruz Roja es reconocido mundialmente.
The Red Cross symbol is recognized worldwide.
Vimos una cruz de piedra antigua en la cima de la colina.
We saw an ancient stone cross on the top of the hill.
Gender Reminder
Even though 'cruz' ends in 'z' and some words ending in 'z' are masculine, 'cruz' is always feminine. Remember to use 'la cruz' or 'una cruz'.
Confusing 'clave' and 'cruz'
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