castle vs turret

castle and turret both are nouns.

Word	Noun	Adjective	Verb	Adverb
castle	Yes	No	Yes	No
turret	Yes	No	No	No

castle (noun)	turret (noun)
interchanging the positions of the king and a rook	a small tower extending above a building
a large building formerly occupied by a ruler and fortified against attack	a self-contained weapons platform housing guns and capable of rotation
(chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
a large and stately mansion

castle (verb)	turret (verb)
move the king two squares toward a rook and in the same move the rook to the square next past the king