puñal
dagger
puño
fist
+
-al
relating to
Puñal means dagger and can be thought of as something relating to1 (-al1) the fist0 (puño0), as a dagger is held in the fist.
noun
- daggerA short, sharp-pointed knife used as a weaponEl asesino usó un puñal para cometer el crimen. // The murderer used a dagger to commit the crime.