LIFEGUARD
lifeguard, lifesaver
(noun) an attendant employed at a beach or pool to protect swimmers from accidents
Source: WordNet® 3.1
Etymology
Noun
lifeguard (plural lifeguards)
(uncommon) A bodyguard or unit of bodyguards, a guard of someone's (especially a king's) life or person.
An attendant, usually an expert swimmer, employed to save swimmers in trouble or near drowning at a body of water.
A lifesaver.
(rail transport) 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.
Source: Wiktionary