Dungeon and Jailhouse

Dungeon noun - The main tower within the walls of a medieval castle or fortress.

Jailhouse and dungeon are semantically related in imprisonment topic. In some cases you can use "Jailhouse" instead a noun "Dungeon".

Jailhouse noun - A place of confinement for persons held in lawful custody.

Dungeon and jailhouse are semantically related in enclosure topic. You can use "Dungeon" instead a noun "Jailhouse", if it concerns topics such as jail, imprisonment, place for incarceration.