An arrowslit (often also referred to as an arrow loop, loophole or loop hole, and sometimes a balistraria) is a narrow vertical aperture in a fortification through which an archer can launch arrows or a crossbowman can launch bolts.
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A narrow vertical slit in a castle wall or tower from which an archer can launch arrows or bolts from a crossbow at attackers. The slit was thin, making it near impossible for attackers on the outside to hit an archer behind the wall as they would have to get their arrows to go through the slit.
In architecture, the talus is a feature of some late medieval castles, especially prevalent in crusader constructions. It consists of a battered (sloping) face at the base of a fortified wall.
In architecture, a turret is a small tower that projects vertically from the wall of a building such as a medieval castle. Turrets were used to provide a projecting defensive position allowing covering fire to the adjacent wall in the days of military fortification.
moat, a depression surrounding a castle, city wall, or other fortification, usually but not always filled with water. The existence of a moat was a natural result of early methods of fortification by earthworks, for the ditch produced by the removal of earth to form a rampart made a valuable part of the defense system.
A portcullis is a heavy castle door or gate made of metal strips that form a grid. A castle guardian might lower the portcullis to protect the people inside from an invading army. It was common during medieval times for castles to be protected by a portcullis or two.
Castle walls could be plastered and whitewashed to protect the walls and mortar. The White Tower in the Tower of London is named for such a reason. Whether a castle would be 'white' would really depend on the plaster used and I'd expect to vary by custom from county to country and from age to age.