The word surmisable 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: 18
Highest Scoring Words With Friends™ Play In The Letters surmisable
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Seven Letter Word Alert: (43 words)
abseils, abusers, aimless, airless, amblers, ambries, armless, assumer, balmier, bariums, bemauls, blamers, braises, braless, bruises, burials, erbiums, imburse, limbers, lumbers, mailers, marbles, masseur, maulers, misrule, misuser, mueslis, rambles, realism, remails, resails, ribless, rimless, rumbles, rumless, sailers, serials, serumal, slumber, smilers, sublime, subrail, surmise