- castleA large residential building or compound that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king. Also, a house or mansion with some of the architectural features of medieval castles.
- CostelloA surname from Irish.
- castellanoA traditional Spanish unit of mass, equivalent to about 4.8 g.
- alcazarAny Moorish fortress in Spain.
- qasrA palace or castle in Middle Eastern countries.
- chatelainSynonym of castellan: the lord of a castle; a caretaker entrusted to oversee a castle for its lord.
- CaisterA habitational surname from Old English.
- castrumAmong the Ancient Romans, a building or plot of land used as a military defensive position.
- -cesterForms placenames, originally those settled by the Roman Empire in Great Britain.
- GjirokastërA city in southern Albania, located in the Drino valley east of the mountain of Gjerë; it is the seat of its eponymous county and municipality.