Warder
Definition 1 of 2

Prison Context
Warder is often used in the context of jails and penitentiaries.

The warder escorted the inmate back to his cell.
Authority Figure
Warder connotes an authoritative role within a prison setting.

As the head warder, she oversees the facility's daily operations.
Not Police
Unlike police, a warder's authority is limited to the prison they work in.

Warders maintain order within the prison, but do not enforce laws outside.
Compare with
attendantcustodiandefenderguardkeeperprotectorsentrywatchman
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