Synonyms and related words :
POW camp, abatis, advanced work, balistraria, bank, banquette, barbed-wire entanglement, barbican, barricade, barrier, bartizan, bastille, bastion, battlement, black hole, borstal, borstal institution, breastwork, bridewell, brig, bulwark, calaboose, can, casemate, cell, cheval-de-frise, circumvallation, concentration camp, condemned cell, contravallation, cooler, coop, counterscarp, curtain, death cell, death house, death row, demibastion, detention camp, dike, drawbridge, earthwork, enclosure, entanglement, escarp, escarpment, federal prison, fence, fieldwork, forced-labor camp, fortalice, fortification, gaol, glacis, guardhouse, guardroom, hoosegow, house of correction, house of detention, industrial school, internment camp, jail, jailhouse, jug, keep, labor camp, lockup, loophole, lunette, machicolation, mantelet, maximum-security prison, merlon, minimum-security prison, mound, oubliette, outwork, palisade, parados, parapet, pen, penal colony, penal institution, penal settlement, penitentiary, portcullis, postern gate, prison, prison camp, prisonhouse, rampart, ravelin, redan, redoubt, reform school, reformatory, sally port, scarp, sconce, sponging house, state prison, tenaille, the hole, tollbooth, training school, vallation, vallum, work