The word faultfinder 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: 21
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (62 words)
affined, daffier, default, defiant, detrain, difuran, dilater, diluent, diluter, direful, diurnal, failure, fainted, fainter, fateful, faulted, fearful, fireant, flirted, fretful, fruited, funeral, funfair, indraft, inflate, intrude, latrine, launder, lunated, natured, neutral, raffled, ratline, reaudit, refutal, reliant, retinal, riffled, ruffian, ruffled, tearful, tendril, tradein, trailed, trained, trenail, trifled, truffle, trundle, unaired, unalert, unalter, undealt, unfired, unideal, unrated, untiled, untired, untread, untried, uralite, urinate