The word unconstraint 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 unconstraint
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Seven Letter Word Alert: (50 words)
actions, anoints, atonics, auction, cannons, cantons, cantors, cartons, cations, caution, citator, citrons, contain, cratons, cuatros, curtain, incants, incrust, instant, intorts, introns, intrust, inturns, nations, nitrous, nonarts, nonsuit, octants, outcast, outrant, rainout, rations, rattons, ricotta, stannic, station, straint, suction, tannins, tantric, toucans, tourist, transit, tricots, truants, uncarts, unction, unicorn, unstain, unstoic