spasilac

1. (at a beach or pool) lifeguard
   Spasilac je izvukao dečaka iz vode. — The lifeguard pulled the boy out of the water.
   Na bazenu uvek dežuraju dva spasioca. — There are always two lifeguards on duty at the pool.
2. rescuer
   Gorski spasioci su celu noć tražili planinare. — Mountain rescuers searched for the hikers all night.
3. saviour
   Ti si moj spasilac, hvala ti što si došao! — You're my saviour, thanks for coming!

Spasitelj with a capital letter refers to Christ; in everyday speech spasilac is usual.