The word coincidental 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™ Play In The Letters coincidental
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Seven Letter Word Alert: (60 words)
accited, aclinic, aconite, actinic, aedilic, aloetic, ancient, anilide, aniline, anionic, annelid, antlion, cacolet, calcine, calcite, cannoli, canonic, catenin, ciliate, citadel, coacted, coalite, cocaine, coeliac, colicin, conceal, conceit, conical, conidia, connect, contain, contend, cotidal, decalin, deictic, deltaic, dialect, diction, dioecic, edition, elation, icecold, incited, incline, intoned, laconic, lactone, lection, located, nonacid, nondate, nondiet, nonlate, nonlead, noticed, oceanic, octadic, tacnode, talonid, toenail