The word unmentionable 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: 24
Highest Scoring Words With Friends™ Plays In The Letters unmentionable
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Seven Letter Word Alert: (62 words)
abluent, ailment, albumen, albumin, aliment, ambient, anemone, annulet, antlion, bailout, beamlet, bimetal, bitumen, boatmen, bonelet, botulin, butanol, elation, elution, eminent, emulant, emulate, enamine, ennoble, enolate, lenient, lineate, lineman, linemen, matinee, melanin, mention, montane, mountie, mutable, nebulae, neonate, netmail, niobate, nominal, nominee, nonlate, nonmail, nonmale, nonmate, nonmeal, nonmeat, nonmute, notable, nutmeal, onetime, outline, taboule, tenable, timbale, toenail, toluene, tunable, unblent, uneaten, unilobe, unmeant