acropolis
advance guard
airhead
avant-garde
bastion
battle line
beachhead
blockhouse
bunker
castle
citadel
donjon
farthest outpost
fasthold
fastness
first line
forefront
fort
fortress
front
front line
front rank
front-runner
garrison
garrison house
hold
keep
line
martello
martello tower
mote
motte
outguard
outpost
peel
peel tower
pillbox
pioneer
point
post
precursor
railhead
rath
safehold
scout
spearhead
strong point
stronghold
tower
tower of strength
station
2-port
and
anti-estrogen
bromonium
commix
counterpropaganda
groupware
injectible
interconnexion
khalif
landmass
ldap
masticatory
onboth
panhandle
peroxyl
practices'
prefectures
provinces'
sally port
trivalent
univalent
unix-based
unsubstituted
vcpu
wu-ftpd