The word deferentially 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: 22
Highest Scoring Words With Friends™ Plays In The Letters deferentially
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Seven Letter Word Alert: (99 words)
alerted, alertly, altered, arenite, deanery, deerfly, deerlet, defiant, defiler, definer, deflate, delayer, deleter, detrain, dialler, dietary, dilater, draftee, dyeline, elderly, enteral, entered, eternal, eyelift, fainted, fainter, faintly, federal, fertile, fielder, fileted, finally, fireant, flailed, fleeted, fleeter, fleetly, flirted, frailly, frailty, frilled, ideally, indraft, inertly, inflate, inlayer, irately, latrine, layered, leafery, leafier, leaflet, learned, lefteye, lenited, lineate, literal, lyrated, needier, needily, needler, rallied, randily, ratline, readily, reality, redealt, redline, refiled, refined, reflate, related, relayed, reliant, relined, retally, retiled, retinal, tallied, tallier, tardily, tearily, teenier, tendril, tidally, tindery, tiredly, tradein, trailed, trained, trainee, treadle, trenail, triaene, trifled, trilled, yearend, yearned, yielder