scarp (n.)
- abatis
- bank
- banquette
- barbican
- barricade
- barrier
- bastion
- battlement
- bevel
- bezel
- bluff
- breastwork
- bulwark
- cheval-de-frise
- chute
- cliff
- crag
- curtain
- dike
- drawbridge
- earthwork
- enclosure
- entanglement
- escarp
- escarpment
- face
- fence
- fieldwork
- fortification
- grade
- gradient
- hillside
- inclination
- incline
- loophole
- lunette
- machicolation
- mantelet
- merlon
- mound
- outwork
- palisade
- parapet
- pitch
- portcullis
- precipice
- ramp
- rampart
- redoubt
- scar
- sconce
- side
- slope
- steep
- stockade
- talus
- wall
- work