A person who lives off others by taking advantage of their generosity without giving anything in return. He was known as a sponger, always borrowing money and never paying it back.
A person who uses a sponge to clean or absorb liquid. The sponger quickly wiped up the spilled juice from the floor.
A person who harvests natural sea sponges, especially as a commercial occupation. Traditional Mediterranean spongers would spend months at sea diving for sponges.