stockade (n.)
- abatis
- bank
- banquette
- barbican
- barricade
- barrier
- bastille
- bastion
- battlement
- borstal
- breastwork
- brig
- bulwark
- can
- cell
- cheval-de-frise
- cooler
- coop
- curtain
- dike
- drawbridge
- earthwork
- enclosure
- entanglement
- escarp
- escarpment
- fence
- fieldwork
- fortification
- gaol
- guardhouse
- guardroom
- hoosegow
- jail
- jailhouse
- jug
- keep
- lockup
- loophole
- lunette
- machicolation
- mantelet
- merlon
- mound
- oubliette
- outwork
- palisade
- parapet
- pen
- penitentiary
- portcullis
- prison
- rampart
- redoubt
- reformatory
- scarp
- sconce
- tollbooth
- work
