The word unsurpassable 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: 23
Highest Scoring Words With Friends™ Play In The Letters unsurpassable
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Seven Letter Word Alert: (44 words)
abasers, abrases, abusers, arsenal, assures, auburns, banaler, braless, brasses, bureaus, lupuses, nabales, napless, nebular, nebulas, neurula, paenula, parable, passers, perusal, planers, plusses, pulsars, pulsers, punless, pursues, replans, resnaps, resnubs, respans, sapless, sarapes, seabass, sensual, subarea, subrule, sunless, surpass, surplus, unbales, unbless, unblurs, unparse, unseals