keep vs castle

keep and castle both are nouns.

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

keep (noun)	castle (noun)
the main tower within the walls of a medieval castle or fortress	interchanging the positions of the king and a rook
a cell in a jail or prison	a large building formerly occupied by a ruler and fortified against attack
the financial means whereby one lives	(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

keep (verb)	castle (verb)
prevent (food) from rotting	move the king two squares toward a rook and in the same move the rook to the square next past the king
prevent the action or expression of
stick to correctly or closely
maintain by writing regular records
supply with necessities and support
hold and prevent from leaving
retain possession of
look after; be the keeper of; have charge of
retain rights to
maintain for use and service
have as a supply
store or keep customarily
stop (someone or something) from doing something or being in a certain state
allow to remain in a place or position or maintain a property or feature
conform one's action or practice to
behave as expected during of holidays or rites
cause to continue in a certain state, position, or activity
supply with room and board
maintain in safety from injury, harm, or danger
fail to spoil or rot
continue a certain state, condition, or activity
to rear