sentry
Gate duty soldier
A sentry is a soldier or guard stationed to watch for danger and control access to a place.
Sentries stand at gates, patrol perimeters, and challenge anyone who approaches: The sentry demanded identification before allowing entry.
The word extends to anything serving a watchful, protective function: Motion sensors act as electronic sentries.
Watchful defensive attention
- soldierArmed forces member
- watchmanBuilding security guard
- patrolRegular surveillance route
- garrisonStationed military force
post · duty · barracks · uniform · infantry · checkpoint · fortification · battalion
Carefully attentive, observant
- alertWarning or watchfulness
- vigilantKeenly aware of danger
- attentivePaying close notice
- observantNoticing things readily
wary · sharp-eyed · eagle-eyed · lookout · scanning · readiness · awareness · circumspect
Attentive watching or remark
- monitoringOngoing observation of something
- watchtowerElevated structure for surveillance
- reconnaissanceInformation-gathering before action
- detectionAct of finding something
perimeter · cameras · motion sensors · night vision · thermal imaging · radar · early warning · tracking
Complete sudden stop
- passwordAuthentication string
- identificationEstablishing who someone is
- credentialsEvidence of qualification or identity
- clearancePermitted passage or approval
authorization · countersign · access · interrogate · verify · inspect
Protective caretaker of another
- keeperOne who guards
- custodianGuardian of a place
- wardenSupervisory custodian of place
- protectorOne who safeguards others
watchdog · gatekeeper · defender · steward · overseer · figurative · metaphorical
Keep from harm
- defendProtect from harm
- safeguardPrecaution against harm
- barrierObstruction preventing passage
- fortificationStrengthening defenses or nutrients
stronghold · citadel · rampart · battlement · gatehouse · drawbridge · portcullis · palisade
guard
Watchful defensive attention
garrison · post · duty · barracks · uniform · infantry · checkpoint · fortification · battalion · outpost
watchful
Carefully attentive, observant
observant · wary · sharp-eyed · eagle-eyed · lookout · scanning · readiness · awareness · circumspect · heedful
observation
Attentive watching or remark
- monitoringOngoing observation of something
- watchtowerElevated structure for surveillance
- reconnaissanceInformation-gathering before action
detection · perimeter · cameras · motion sensors · night vision · thermal imaging · radar · early warning · tracking · spotting
halt
Complete sudden stop
- passwordAuthentication string
- identificationEstablishing who someone is
- credentialsEvidence of qualification or identity
clearance · authorization · countersign · access · interrogate · verify · inspect
guardian
Protective caretaker of another
protector · watchdog · gatekeeper · defender · steward · overseer · figurative · metaphorical
protect
Keep from harm
fortification · stronghold · citadel · rampart · battlement · gatehouse · drawbridge · portcullis · palisade · bulwark
- security guardsguard, watchman, night watchman, security guard, armed guard
- helpersnurse, helper, volunteer, aide, assistant
- Roman militarylegion, cohort, centurion, legionnaire, legionaries
- defense systemsshield, armor, missile defense, bunker, radar
- military policeMP, MPs, military police, shore patrol, provost
- royal guardsroyal guard, Beefeater, guardsman, Swiss Guard, Queen's Guard
sentryintruder
Unauthorized person present
infiltrator · trespasser · invader · saboteur · spy
sentrypatrol
Regular surveillance route
scout · reconnaissance · rover · mobile unit · picket
- sentient beingThing with awareness
- sentry dutyAssigned protective surveillance shift
- sentry postStation for watchkeepers
- sentient machinesTechnology with awareness
- sentry boxShelter for posted watchmen
- sentient AISoftware with subjective experience
sentient, sentinel, sentries, sentinels, sentry-box, sentry post, sentry-boxes