1. Work which involves giving help and advice to people with serious financial problems or family problems. English = social work, welfare work.
2. A person whose job is to do social or welfare work. English = social worker, welfare worker.
3. Someone whose job is to be in charge of something, especially an institution (such as a hospital, hostel, dormitory, welfare association etc.). He or she is also often a social or welfare worker. English = superintendent.