chess move vs castle

chess move and castle both are nouns.

Word	Noun	Adjective	Verb	Adverb
chess move	Yes	No	No	No
castle	Yes	No	Yes	No

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

Other hyponyms of chess move include castling, capture, check, checkmate, mate, gambit.

chess move (noun)	castle (noun)
the act of moving a chess piece	interchanging the positions of the king and a rook
	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

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