The word supranational 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: 20
Highest Scoring Words With Friends™ Play In The Letters supranational
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Seven Letter Word Alert: (78 words)
annuals, annular, anoints, antlion, aplasia, arousal, artisan, atonias, atropia, aupairs, austral, insular, introns, inturns, lariats, lunaria, nations, natural, nitrous, nonarts, nonliar, nonplus, nonslip, nonsuit, nostril, nuptial, outplan, outraps, outsail, outspan, outspar, outspin, parasol, partial, patinas, patrial, patrols, patrons, plantar, plutons, portals, puritan, purlins, purloin, rainout, rations, rituals, saltpan, saponin, saurian, slipout, spartan, spatial, spatula, spinout, stipula, sultana, suntrap, tailors, tarpans, toprail, topsail, tsarina, turnips, unpairs, unsnarl, unsplit, unstain, unstrap, unstrip, untraps, uprisal, upsilon, upslant, upstair, urinals, utopian, utopias