What It Scores
ZZZS is a valid word in the tournament list this site uses. Tile values only, before any premium square: 31 in Scrabble and 31 in Words With Friends. The letters break down as Z10 Z10 Z10 S1.
Words Made From The Letters In ZZZS
1 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.
3 letter words (1)
Next: the Word Unscrambler for any letters at all. Full entry and definition at Merriam-Webster.