The definition of a sentinel is a person or animal that keeps guard.
One who prevents interference.
A chain or cord attached to a watch, bracelet, etc. to protect against loss
(Nautical) A group of sailors and officers aboard a ship or shore station with a common period of duty: starboard watch, port watch.
A person on watch for approaching enemy, police, etc.
A group of soldiers or a single soldier stationed, usually at an outpost, to guard a body of troops from surprise attack
The definition of a ward is a wing of a hospital, a division of a prison, or a person, especially a child, who is dependent upon the care and support of an appointed guardian.
a person employed to keep watch for some anticipated event
A person or thing that spots
(Informal) An individual; a person:
Find another word for sentry. In this page you can discover 15 synonyms, antonyms, idiomatic expressions, and related words for sentry, like: sentinel, protector, guard, watch, lookout, picket, ward, awareness, safety, lookout-man and spotter.