Another word for guard
sentry, sentinel, protector, curator, watchman, night watchman, security officer, security guard, lookout, caretaker, custodian, keeper, police officer, patrolman, defender, warder, jailer, turnkey, watchdog, screw*; see also guardian 1, police officer.
To watch over
watch, observe, superintend, stand sentinel, patrol, picket, police, look out, look after, see after, supervise, tend, keep in view, keep an eye on, keep under surveillance, attend, overlook, keep a prisoner, hold in custody, stand over, babysit, care for, keep vigil, look to, see to, chaperone, shepherd, oversee, keep a weather eye*, ride herd on*, keep tabs on*, be a father to*.
Another word for guardverb
To keep safe from danger, attack, or harm:defend, preserve, protect, safeguard, secure, shield, ward. (Archaic) fend. See attack
A person or special body of persons assigned to provide protection or keep watch over, for example:lookout, picket, protector, sentinel, sentry, ward, watch. See awareness, safety
The act or a means of defending:defense, preservation, protection, protector, safeguard, security, shield, ward. See attack