acropolis
bastion
beachhead
blockhouse
bridgehead
bunker
castle
citadel
donjon
fasthold
fastness
fort
fortress
garrison
garrison house
hold
keep
martello
martello tower
mote
motte
peel
peel tower
post
rath
safehold
strong point
stronghold
tower
tower of strength
ward
case
gun emplacement
millinery
weapons emplacement
woman's hat
astrakhan
brimless
casemate
deerstalker
door-knob
gold-laced
high-peaked
long-billed
low-crowned
military-style
ornithopter
pageboy
pink-tipped
punk-rock
revetments
sticky-up
topiary
white-plumed