How to Say "keeper" in Spanish
The Spanish word for “keeper” is “guardián” — B1 level. This is a very common word in everyday Spanish.

Examples
El guardián de seguridad revisó mi bolso antes de entrar al museo.
The security guard checked my bag before entering the museum.
El zoológico tiene un guardián especial para los tigres.
The zoo has a special keeper for the tigers.
Los guardianes de la prisión están en huelga.
The prison guards are on strike.
Gender Match
Since 'guardián' is a masculine noun, any descriptive words (adjectives) you use with it must also be masculine: 'el viejo guardián' (the old guard).
Confusing the Job and the Action
Mistake: “Muchos guardianes guardan la puerta. (Many guards guard the door.)”
Correction: This is grammatically correct but sounds repetitive. Try: 'Muchos guardianes protegen la puerta.' (Many guards protect the door.)
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