Zs are another letter that can be troublesome while playing String Theory: A Word Game. It can be hard to think of words that use a Z or two. Zs tend to appear toward the end of a given word. I like to play them to the right hand side and lower half of the board. This generally gives me time to plan ahead and use that other Z for words like Jazz or Fuzz. Zs are actually easier to use than that darned Q.
Some 3 letter Z words: adz, azo, coz, fez, fiz, wiz, zag, zap, zas, zax, zed, zee, zek, zig, zin, zip, zit, zoa, zoo, zuz, zzz
Some 4 letter Z words: adze, azan, azon, buzz, chez, cozy, daze, ditz, doze, faze, fizz, gaze, haze, hazy, jazz, jeez, laze, lazy, lutz, maze, mazy, ooze, orzo, putz, quiz, raze, size, spaz, whiz, zags, zany, zaps, zeal, zeds, zees