The word accidentals 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: 20
Highest Scoring Words With Friends™ Play In The Letters accidentals
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Seven Letter Word Alert: (57 words)
accents, accited, accites, aliased, alicant, antacid, ascetic, calcine, calcite, cancels, candela, candies, candles, cantles, cascade, castile, castled, cicadas, citadel, cladist, clastic, clients, dacites, decalin, decants, delicts, delints, deltaic, denials, dentals, dentils, descant, destain, details, detains, dialect, dilates, discant, elastic, elastin, entails, incased, instead, laciest, lactase, lancets, nailset, saccate, sainted, salient, satanic, scandal, sealant, slanted, snailed, stained, stencil