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

Examples
El lobo regresó a su guarida con comida para sus cachorros.
The wolf returned to its den with food for its cubs.
Los bandidos tenían una guarida secreta en lo profundo del bosque.
The bandits had a secret hideout deep in the forest.
Mi habitación es mi guarida; nadie me molesta cuando estoy allí.
My room is my hideaway; nobody bothers me when I'm there.
Always Feminine
Even though it doesn't describe a person, 'guarida' is always a feminine noun. You must use 'la' or 'una' regardless of who or what lives inside it.
Describing the Resident
To say whose den it is, just use 'de' (of). For example: 'la guarida de los leones' (the lions' den).
Guarida vs. Casa
Mistake: “Using 'guarida' to mean a normal home.”
Correction: Use 'casa' or 'hogar' for a normal house. Use 'guarida' only if you want to sound like it's a secret spot, a messy place, or a place for animals.
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