Synonyms of sentinel

1 Syllable
guard
2 Syllables
watchman, patrol, spotter, spotters, picket, guardian, keepers, sentry, flagger, watcher, protect, flagman, watchmen, guardians, watchers, lookout, sentries, keeper, patrols
3 Syllables
signaller, patrolled, watchperson, signalmen, watchkeeper, protector, protecting, watchwoman, signalman
4 Syllables
watchman/woman, gatekeepers, gatekeeper, belvedere