security guard

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a guard who keeps watch
• Syn:
watchman, watcher
• Derivationally related forms:
watch (for: watcher)
• Hypernyms:
guard
• Hyponyms:
bank guard, fire watcher, lookout, lookout man, sentinel,
sentry, watch, spotter, scout, picket, night watchman,
patroller, portwatcher, port watcher
• Member Holonyms:
security force, private security force