skela

1. (on a river) ferry
   Preko Dunava smo prešli skelom. — We crossed the Danube by ferry.
   Skela ne radi kad je reka previsoka. — The ferry doesn't run when the river is too high.
2. (in construction) scaffolding; scaffold
   Radnici su postavili skelu oko cele zgrade. — The workers put up scaffolding around the whole building.

Skela is usually a river ferry; a sea ferry is usually called trajekt.