What It Scores
ZOBU is a valid word in the tournament list this site uses. Tile values only, before any premium square: 15 in Scrabble and 17 in Words With Friends. The letters break down as Z10 O1 B3 U1.
Words Made From The Letters In ZOBU
4 shorter words come out of these tiles. On a board that matters more than the long play, because a short word on a premium square often beats a long one on plain squares.
2 letter words (4)
Longer Words Containing ZOBU
ZOBU 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.