abatis, advanced work, arena, bailey, balistraria, bank, banquette, barbed-wire entanglement, barbican, barnyard, barricade, barrier, bartizan, barton, bastion, battlement, boundary, box, breastwork, bulwark, cage, casemate, cheval-de-frise, cincture, circling, circumambience, circumambiency, circumcincture, circumflexion, circumjacence, circumposition, circumvallation, close, compound, confine, container, containment, contravallation, coop, corral, cote, counterscarp, court, courtyard, crib, croft, curtain, curtilage, delimited field, demibastion, dike, dog pound, drawbridge, earthwork, embracement, encincture, encirclement, enclave, encompassment, enfoldment, entanglement, envelopment, environment, escarp, escarpment, farmyard, fence, field, fieldwork, fold, fortalice, fortification, girding, girdling, glacis, ground, hedge, hell, hutch, inclusion, involvement, kraal, limbo, list, loophole, lunette, machicolation, manger, mantelet, merlon, mound, outwork, paddock, pale, paling, palisade, parados, parapet, park, pasture, pen, penfold, pigpen, pigsty, pinfold, place of confinement, polygon, portcullis, postern gate, pound, purgatory, quad, quadrangle, rail, railing, rampart, ravelin, redan, redoubt, rink, run, runway, sally port, scarp, sconce, square, stall, stockade, stockyard, sty, surrounding, tenaille, theater, toft, vallation, vallum, wall, work, yard