Synonyms of 'jailer'
guardDictionary, keeper, warden (US , Canadian)
The chief said someone slugged the jailer and opened the cell.
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You can refer to the person who has captured a person or animal as their captor.
They did not know what their captors had planned for them.
Thesaurus for jailer from the Collins English Thesaurus
A jailer is a person who is in charge of a jail and the prisoners in it.