CUE - An action or event that is a signal for somebody to do something.
CUT - Having been cut.
DUD - A device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile.
CUTE - Possessing physical features, behaviors, personality traits or other properties that are mainly attributed to infants and small or cuddly animals; e.g. fair, dainty, round, and soft physical features, disproportionately large eyes and head, playfulness, fragility, helplessness, curiosity or shyness, innocence, affectionate behavior.
DUCT - A pipe, tube or canal which carries air or liquid from one place to another.
DUDE - A man.
DUET - A musical composition in two parts, each performed by a single voice (singer, instrument or univoce ensemble).
DEDUCT - To take one thing from another; remove from; make smaller by some amount.