What It Scores
ZEK is a valid word in the tournament list this site uses. Tile values only, before any premium square: 16 in Scrabble and 16 in Words With Friends. The letters break down as Z10 E1 K5.
Longer Words Containing ZEK
ZEK appears inside each of these, which is what makes it worth knowing as a hook.
Next: the Word Unscrambler for any letters at all, and the two and three letter lists. Full entry and definition at Merriam-Webster.