A guard who keeps watch.
synoniemen: security guard, watcher.
Roget 664:
safety,
security,
surety,
impregnability;
invulnerability,
invulnerableness
etc.
adj.;
danger past,
danger over;
storm blown over;
coast clear;
escape
etc.
671;
means of escape;
blow valve,
safety valve,
release valve,
sniffing valve;
safeguard,
palladium.
guardianship,
wardship,
wardenship;
tutelage,
custody,
safekeeping;
preservation
etc.
670;
protection,
auspices.
safe-conduct,
escort,
convoy;
guard,
shield
etc.
(defense)
717;
guardian angel;
tutelary god,
tutelary deity,
tutelary saint;
genius loci.
protector,
guardian;
warden,
warder;
preserver,
custodian,
duenna [Sp.],
chaperon,
third person.
watchdog,
bandog†;
Cerberus;
watchman,
patrolman,
policeman;
cop [Slang],
dick [Slang],
fuzz [Slang],
smokey [Slang],
peeler [Slang],
zarp [Slang];
sentinel,
sentry,
scout
etc.
(warning)
668;
garrison;
guardship†.
[Means of safety]
refuge
&c.,
anchor
etc.
666;
precaution
etc.
(preparation)
673;
quarantine,
cordon sanitaire [Fr.].
[Sense of security].
confidence
etc.
858
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Roget 668:
warning,
early warning,
caution,
caveat;
notice
etc.
(information)
527;
premonition,
premonishment†;
prediction
etc.
511;
contraindication,
lesson,
dehortation†;
admonition,
monition;
alarm
etc.
669.
handwriting on the wall,
mene mene tekel upharsin,
red flag,
yellow flag;
fog-signal,
foghorn;
siren;
monitor,
warning voice,
Cassandra†,
signs of the times,
Mother Cary's chickens†,
stormy petrel,
bird of ill omen,
gathering clouds,
clouds in the horizon,
death watch.
watchtower,
beacon,
signal post;
lighthouse
etc.
(indication of locality)
550.
sentinel,
sentry, ,
watch,
watchman;
watch and ward;
watchdog,
bandog†,
housedog†;
patrol,
patrolman,
vedette†,
picket,
bivouac,
scout,
spy,
spial†;
undercover agent,
mole,
plainclothesman;
advanced guard,
rear guard;
lookout.
cautiousness
etc.
864.
monitor,
guard camera,
radar,
AWACS,
spy satellite,
spy-in-the-sky,
U2 plane,
spy plane.
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Roget 753:
keeper,
custodian,
custos [Lat.],
ranger,
warder,
jailer,
gaoler,
turnkey,
castellan†,
guard;
watchdog,
watchman;
Charley;
chokidar†,
durwan†,
hayward†;
sentry,
sentinel;
watch and ward;
concierge,
coast guard,
guarda costa [Sp.],
game keeper.
escort,
bodyguard.
protector,
governor,
duenna [Sp.];
guardian;
governess
etc.
(teacher)
540;
nurse,
nanny,
babysitter,
catsitter,
dogsitter,
bonne [Fr.],
ayah†.
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Nederlands: wacht, wachter, wachtpost, waker