Castle

Proper noun

1. A surname transferred from the common noun referring to someone who lived in or worked in a castle
2. Castle class, a class of steam locomotives used on the GWR
3. The first part of the name of certain nuclear tests by the US: Castle Bravo, Castle Romeo, Castle Yankee etc. See Operation Castle.
4. University College, Durham, a constituent college located in Durham Castle
5. A place name:

   1. A hamlet in Bowerchalke parish, south-west Wiltshire, England (OS grid ref SU0122).

   2. A community (without a council) in Cardiff, Wales; it includes Cardiff Castle.

   3. A community (without a council) in Swansea, Wales; it includes Swansea Castle.

   4. A town in Okfuskee County, Oklahoma, United States, derived from the surname.