The term 'rudder support' refers to the components that help to stabilize and guide a boat. The two crossword solutions for this term are 'skeg' (4 letters) and 'skegs' (5 letters). A skeg is a fin-like structure that is attached to the bottom of a boat's hull, usually near the stern, and helps to provide directional stability. Skegs are also used to protect the rudder from damage. Multiple skegs can be used in combination to provide additional support and stability.