The word decussating 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: 19
Highest Scoring Words With Friends™ Play In The Letters decussating
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Seven Letter Word Alert: (73 words)
ascends, ascents, ascites, augites, aunties, cagiest, candies, caseins, casings, casting, causing, ceasing, cussing, dacites, decants, degauss, degusts, descant, designs, destain, detains, digests, discant, discase, disgust, dissect, dissent, ductase, ducting, dunites, dusting, educing, gaudies, gaunted, guineas, gussied, incased, incests, induces, inducts, ingests, insects, instead, nudists, nutcase, sagiest, sainted, sanctus, saucing, seating, secants, seitans, sestina, signets, sinuate, snidest, snudges, stained, stances, studies, sudates, sudsing, sundaes, sustain, teasing, tissued, uncaged, uncages, uncased, uncited, unsated, unseats, unstage