According to wikipedia nautical terms and go sailing:
An air or foam filled bumper used in boating to keep boats from banging into docks or each other.
[SIZE=3pt] Fairleads: A metal fitting through which lines are run to in order to change the direction of the lines while reducing friction on the lines.
Fairway: Sailing on inland waters, fairway means an open channel or being in midchannel.
Fast: To make fast. To secure (snugly tie) a line to something.
Fathoms: A unit of measurement. One fathon equals 6 feet.
Fenders: Cylindrical air filled plastic or rubber bumpers hung off the side of a boat or dock to prevent damage to both dock and boat.
Fetch: The distance over open water the wind has blown.
Faked: A line is faked by zig zagging it back and forth so that when it is used it will not tangle on itself.
Flaked:A sail is flaked when lowered. Flaking a sail is the process of folding the sail back and forth upon itself like the blades on a paper fan. Flaking a sail will help prolong the sail life.
Foot (Sail): The foot of a sail is the lower part of the sail. In the case of a mainsail, this is the part of the sail that runs along the boom.
Forestay: The forestay is a wire that runs from the top of the mast (or near the top of the mast) to the bow of the boat. The forestay supports the mast from falling backwards and is also used in shaping the bend in the mast for maximum efficiency. The luff (front) of the foresails (jib, genoa) are also generally attached to the forestay depending on the rigging system.
Forward: When on a boat, forward means towards the bow. "Move forward" - move towards the front of the boat.[/size]