How to Say "impostor" in Spanish
The Spanish word for “impostor” is “impostor” — B1 level.

Examples
El impostor se hizo pasar por un cirujano famoso.
The impostor pretended to be a famous surgeon.
Nadie sospechaba que el nuevo vecino era un impostor.
No one suspected that the new neighbor was an impostor.
La policía finalmente atrapó al impostor en el aeropuerto.
The police finally caught the impostor at the airport.
The 'Personal A'
When you are doing something to an impostor (like seeing or catching them), you must put 'a' before the word: 'Vi a un impostor'.
Gendered Endings
This version (impostor) is for a man. If you are talking about a woman, you must use 'impostora' and change the words around it to match.
Confusing with 'Mentiroso'
Mistake: “Calling someone an 'impostor' just because they lied about their age.”
Correction: Use 'mentiroso' for a liar. An 'impostor' specifically steals an identity or a specific role they don't have.
Related Translations
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