The word acidulousness 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™ Play In The Letters acidulousness
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Seven Letter Word Alert: (89 words)
acnodes, adonise, aidless, aldoses, anodise, ascends, caisson, candies, candles, caseins, casinos, cassons, cauline, celosia, celsius, cession, classed, classes, clauses, coalise, consuls, cosines, counsel, cousins, deacons, decalin, declass, denials, discase, discuss, dualise, dulcian, elusion, ensouls, escudos, incased, include, indoles, induces, insoles, inulase, islands, lassies, lassoed, lassoes, lesions, lessons, lioness, nodules, nucleus, nuclide, oilcans, oldness, osseins, ossicle, sacless, sadness, salines, sealion, seasons, seconds, sensual, session, silanes, sinless, sinuous, sinuses, sluiced, sluices, snailed, socials, sodless, solaced, solaces, sonless, sundaes, sundial, sunless, uncased, unclads, unclose, uncloud, uncoils, unideal, unlaced, unlaces, unloads, unoiled, unseals