A dungeon with the only entrance or exit being a trap door in the ceiling.
Roget 530:
camouflage;
mimicry;
hiding place;
secret place,
secret drawer;
recess,
hold,
holes and corners;
closet,
crypt,
adytum†,
abditory†,
oubliette.
ambush,
ambuscade;
stalking horse;
lurking hole,
lurking place;
secret path,
back stairs;
retreat
etc.
(refuge)
666.
screen,
cover,
shade,
blinker;
veil,
curtain,
blind,
cloak,
cloud.
mask,
visor,
vizor†,
disguise,
masquerade dress,
domino.
pitfall
etc.
(source of danger)
667;
trap
etc.
(snare)
545.
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Roget 752:
prison,
prison house;
jail,
gaol,
cage,
coop,
den,
cell;
stronghold,
fortress,
keep,
donjon,
dungeon,
Bastille,
oubliette,
bridewell†,
house of correction,
hulks,
tollbooth,
panopticon†,
penitentiary,
guardroom,
lockup,
hold;
round house,
watch house,
station house,
sponging house;
station;
house of detention,
black hole,
pen,
fold,
pound;
inclosure
etc.
232;
isolation
(exclusion)
893;
penal settlement,
penal colony;
bilboes,
stocks,
limbo,
quod [Lat.];
calaboose,
chauki†,
choky†,
thana†;
workhouse [U.S.].
Newgate,
Fleet,
Marshalsea;
King's Bench,
Queen's Bench.
bond;
bandage;
irons,
pinion,
gyve,
fetter,
shackle,
trammel,
manacle,
handcuff,
straight jacket,
strait jacket,
strait-jacket,
strait-waistcoat,
hopples†;
vice,
vise.
yoke,
collar,
halter,
harness;
muzzle,
gag,
bit,
brake,
curb,
snaffle,
bridle;
rein,
reins;
bearing rein;
martingale;
leading string;
tether,
picket,
band,
guy,
chain;
cord
etc.
(fastening)
45;
cavesson†,
hackamore [U.S.],
headstall,
jaquima [U.S.],
lines,
ribbons.
bolt,
deadbolt,
bar,
lock,
police lock,
combination lock,
padlock,
rail,
wall,
stone wall;
paling,
palisade;
fence,
picket fence,
barbed wire fence,
Cyclone fence,
stockade fence,
chain-link fence;
barrier,
barricade.
drag
etc.
(hindrance)
706.
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Nederlands: kerker met valluik, vergetelput