Caskett

Etymology
.

Proper noun

 * 1)  The ship of characters  and  from the television series .
 * 2) * 2012, Jean Bentley, "'Castle' showrunner reveals what's in store for 'Caskett'", Chicago Tribune, 11 May 2012, Section 4, page 8:
 * But while it's great that Caskett finally happened, things didn't turn out so happily for one of "Castle's" other fan-favorite pairings.