Alcazaba. Also of Arabic origin (Al-qasaba, stronghold), it is used to name fortifications built inside a city, specially in Southern Spain (Córdoba, Alcalá la Real, Almería, or Málaga).

Almena. (English merlon). A line of prismatic stone fortification elements that line the tops of walls, crenells, crenellation, merlons. Usually refers to crenellation where the merlons are capped with a stone spike or pyramidal coping.

Arcada. A line of arches, sometimes in conjunction with a colonnade, usually built along a wall or around a courtyard.

Bastión. A fortification element that projects outward, beyond the main fortress, to cover dead ground. Used mainly in association with modern artillery fortresses.

Castro. Pre-Romanic (Celtic or Celtiberian) fortified village. Example: "Castro de la Ventosa", at Cacabelos, or the ancient castro of Molina de Aragón. It also appears at the name of many fortified towns: Castrourdiales, Castrotorafe, Castrofuerte, Castroverde, Castrillo, Puentecastro ...

Cuidadela. Citadel. It is used to describe a fortified location or fortress with a garrison, and often refers to modern artillery fortresses.

Matacán. A projection built onto the outer surface of a wall, parapet or gate with holes or slits on the bottom. The structures allowed the protected defenders to pour hot oil, boiling water and rubble, etc. at the enemy below.

Mota. Low hill placed on a plain. It is usually (but not always) artificial. Examples: "Castillo de la Mota" at Medina del Campo, or Benavente; "Mota del Marqués", at the town of the same name.

Mudéjar. Population of Muslim religion who lived in the Christian kingdoms. Also the architectural style, with Arab influences, that was developped at Spain at XIV, XV & XVI centuries, and usually performed by Mudéjares or Moriscos (Christians descendant of Muslims). Example: the castle of Coca is built at this style.

Torre. Tower. It is used to describe a fortified location usually consisting of a single tower defending a region or shoreline, but towers are often referred to as fortresses.

Torre albarrana. A tower which is built separated from the main wall of a fortification, and connected to it by means of an arch.