The word waterfinder is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 19
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (62 words)
arenite, defiant, definer, dernier, detrain, dewater, draftee, drafter, drainer, drifter, dwarfer, fainted, fainter, ferried, ferrite, fireant, indraft, inerter, nerdier, randier, readier, redraft, redrawn, refined, refiner, refired, refrain, refried, reinter, retired, retrade, retrain, retread, retried, retwine, rewater, rewired, rewrite, tardier, tarried, tarweed, tawnier, tearier, terrain, terrane, tinware, tireder, tradein, trained, trainee, trainer, treader, triaene, wafered, waferer, wartier, watered, waterer, wearied, wearier, weirder, widener