A jailer is a person responsible for keeping inmates in custody and maintaining order within a jail. However, there are several synonyms for the word "jailer" which one can use to give their writing a bit of variation. One of the common synonyms for jailer is "warden," which is a term used to refer to the person in charge of a particular prison or jail. Another synonym for jailer is "turnkey," a term that dates back to medieval times when jail keepers were tasked with keeping a large key that could open all of the cells in their jail. Other synonyms of jailer include prison officer, correctional officer, jail keeper, captor, guard, and keeper.