castle vs short castle

castle and short castle both are nouns.

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

As nouns, short castle is a hyponym of castle; that is, short castle is a word with a more specific, narrower meaning than castle:

Other hyponyms of castle include castling short, short castling, castling long, long castle, long castling.

castle (noun)	short castle (noun)
interchanging the positions of the king and a rook	Castling on the kingside.
a large building formerly occupied by a ruler and fortified against attack
(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)	short castle (verb)
move the king two squares toward a rook and in the same move the rook to the square next past the king