The word decussation 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: 17
Highest Scoring Words With Friends™ Play In The Letters decussation
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Seven Letter Word Alert: (85 words)
acnodes, aconite, actions, adonise, anodise, ascends, ascents, ascites, astound, atonics, auction, aunties, caisson, candies, caseins, casinos, cations, caution, cession, coasted, coedits, conduit, consist, cosiest, cosines, counted, cousins, dacites, deacons, decants, descant, destain, detains, discant, discase, dissect, dissent, donates, ductase, dunites, escudos, eudicot, incased, incests, induces, inducts, insects, instead, nosiest, noticed, notices, nudists, nutcase, octanes, oecists, outside, sainted, sanctus, scouted, secants, seconds, section, seitans, sestina, sinuate, snidest, snouted, stained, stances, studies, studios, suction, sudates, sundaes, sustain, tacnode, tedious, tissued, tocsins, toucans, uncased, uncited, unsated, unseats, unstoic