The word unprintable 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: 21
Highest Scoring Words With Friends™ Plays In The Letters unprintable
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Seven Letter Word Alert: (45 words)
abluent, annulet, biplane, blunter, entrain, lantern, latrine, nebular, neutral, nuptial, painter, pentail, pertain, petunia, pinenut, pinnate, pinnule, plainer, planner, planter, plebian, praline, punnier, puritan, ratline, rebuilt, reinput, reliant, repaint, replait, replant, retinal, trenail, triable, tribune, trunnel, tunable, turbine, unalert, unalter, unblent, unearnt, unlearn, uralite, urinate