The word dissymmetries 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 dissymmetries
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Seven Letter Word Alert: (55 words)
deities, demerit, demises, demists, deserts, desires, desists, dessert, diester, dieters, dieties, dimeter, dimmers, dimmest, dirties, dismiss, ditsier, dresses, immerse, itemise, merited, messier, metrise, midterm, mimesis, misdeem, misedit, misters, mistier, mistime, mitered, reedits, reemits, resides, resists, restems, retimed, retimes, simmers, sissier, sisters, smiters, stemmed, stimied, stimies, strides, stymied, stymies, systems, tidiers, timider, tressed, tresses, tridems, trimmed