What It Scores
KUKU is a valid word in the tournament list this site uses. Tile values only, before any premium square: 12 in Scrabble and 14 in Words With Friends. The letters break down as K5 U1 K5 U1.
Longer Words Containing KUKU
KUKU appears inside each of these, which is what makes it worth knowing as a hook.
Next: the Word Unscrambler for any letters at all. Full entry and definition at Merriam-Webster.