The difference between Castellany and Castle

Castellany as a noun (historical):

The office of a castellan, the lordship of a castle.

Castellany as a noun (historical):

The jurisdiction of a castellan, the district controled by a castle.

Castle as a noun:

A large building that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king.

Castle as a noun (chess):

An instance of castling.

Castle as a noun (chess, informal):

A rook; a chess piece shaped like a castle tower.

Castle as a noun (shogi):

A defense structure in Japanese chess in which the king (玉) is positioned in a certain way so that it is protected by pawns (歩) and silver general(s) (銀) and/or gold general(s) (金) often with an additional knight (桂) and lance (香車).

Castle as a noun (obsolete):

A close helmet.

Castle as a noun (dated):

Any strong, imposing, and stately mansion.

Castle as a noun (dated):

A small tower, as on a ship, or an elephant's back.

Castle as a verb (transitive):

To house or keep in a castle.

Castle as a verb (transitive, figurative):

To protect or separate in a similar way.

Castle as a verb (obsolete):

To make into a castle: to build in the form of a castle or add (real or imitation) battlements to an existing building.

Castle as a verb (usually, _, intransitive, chess):

To move the king 2 squares right or left and, in the same turn, the nearest rook to the far side of the king. The move now has special rules: the king cannot be in, go through, or end in check; the squares between the king and rook must be vacant; and neither piece may have been moved before castling.

Castle as a verb (usually, _, intransitive, shogi):

To create a similar defensive position in Japanese chess through several moves.

Castle as a verb (cricket):

To bowl a batsman with a full-length ball or yorker such that the stumps are knocked over.