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

Examples
El cartel de la piscina tenía una advertencia clara sobre la profundidad.
The pool sign had a clear warning about the depth.
Ignoró la advertencia del médico y siguió comiendo dulces.
He ignored the doctor's warning and kept eating sweets.
Recibió una advertencia por llegar tarde al trabajo tres veces.
She received a warning for being late to work three times.
Gender Rule
Even though 'advertencia' starts with 'a,' it is a feminine noun, so you must use 'la' (la advertencia).
Confusing Noun and Verb
Mistake: “Using 'advertencia' when you mean the action of warning ('advertir').”
Correction: Remember, 'advertencia' is the thing (the warning itself). The verb is 'advertir' (to warn).
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