An attendant, usually an expert swimmer, employed to save swimmers in trouble or near drowning at a body of water.
A lifesaver.
A sturdy metal bracket fixed in front of each of the leading wheels of a train to deflect small objects away from the wheels to prevent derailment.
A bodyguard or unit of bodyguards, a guard of someone's (especially a king's) life or person.
An individual trained to medically stabilize people through various interventions, victims of trauma or medical events outside of a hospital setting and preparing them for transport to a medical facility.
An individual who is licensed at the state or national level to practice medical interventions in an emergency pre-hospital setting.