bastion (n.)
- abatis
- acropolis
- bank
- banquette
- barbican
- barricade
- barrier
- battlement
- beachhead
- blockhouse
- breastwork
- bridgehead
- bulwark
- bunker
- castle
- cheval-de-frise
- citadel
- curtain
- dike
- donjon
- drawbridge
- earthwork
- enclosure
- entanglement
- escarp
- escarpment
- fastness
- fence
- fieldwork
- fort
- fortification
- fortress
- garrison
- hold
- keep
- loophole
- lunette
- machicolation
- mantelet
- merlon
- mote
- mound
- outwork
- palisade
- parapet
- peel
- pillbox
- portcullis
- post
- rampart
- rath
- redoubt
- safehold
- scarp
- sconce
- stockade
- stronghold
- tower
- ward
- work
And topples round the dreary west
A looming bastion fringed with fire.
