Windsor, for one, is a term used to refer to the British Royal Family. The crossword solutions for this term are KNOT (4 letters), CASTLE (6 letters), and TIE (3 letters). A KNOT is a type of fastening or binding that is created by looping a rope or cord around itself. A CASTLE is a large fortified building or group of buildings, typically built in the Middle Ages as a residence of a monarch or noble. A TIE is a piece of clothing worn around the neck and knotted at the throat.