parapet (n.)
- abatis
- backstop
- bank
- banquette
- bar
- barbican
- barrage
- barricade
- barrier
- bastion
- battlement
- boom
- breakwater
- breastwork
- buffer
- bulkhead
- bulwark
- cheval-de-frise
- cofferdam
- curtain
- dam
- defense
- dike
- ditch
- drawbridge
- earthwork
- embankment
- enclosure
- entanglement
- escarp
- escarpment
- fence
- fieldwork
- fortification
- gate
- groin
- jam
- jetty
- levee
- logjam
- loophole
- lunette
- machicolation
- mantelet
- merlon
- milldam
- moat
- mole
- mound
- outwork
- palisade
- portcullis
- rampart
- redoubt
- roadblock
- scarp
- sconce
- seawall
- stockade
- wall
- weir
- work
