Fosse

FOSSE: A ditch.
GALLEY: A long passage or room.
HALL: The principal room in the keep, used for receiving guests and for a major entertainments.

Fosse: Ditch. Freestone: High quality sand- or lime-stone. Fresco: Painting on wet plaster wall.
G Gable: Wall covering end of roof ridge. Gallery: An upper story over the aisle which opens onto the nave or choir.

Foss, Fossa, Fossae, Fosse: (1) A ditch, moat, canal or pit, which were used to impede the advance of an enemy force. See ditch.

FormworkTemporary framing of timber or metal used for casting concrete; also called shuttering.FosseA defensive ditch.Four-centred arch ...

Nevertheless each castle would be composed of a number of common features which could include a rock-cut fosse or ditch, a glacis or stone revetment and one or more sets of curtain wall linked by towers, with possibly a keep in the middle.

Fortalice - small fort or outworks of a fortification.
Fosse - ditch.
Freestone - high quality sandstone or limestone.
Fresco - painting on wet plaster wall.
Frieze - a horizontal band of ornament.
...

See also: Architecture, Tower, Curtain wall, Medieval, Principal