The word pilasters 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: 13
Highest Scoring Words With Friends™ Play In The Letters pilasters
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Seven Letter Word Alert: (47 words)
airless, aplites, artless, aspires, lipases, lispers, palsies, palters, paresis, parties, pastels, pasters, pastier, pasties, persist, pilates, pirates, pitless, plaster, platers, praises, priests, rapists, realist, relists, repasts, replait, resails, resplit, retails, sailers, saltier, satires, serials, slaters, slatier, sparest, spirals, spireas, spriest, sprites, stapler, staples, stripes, tipless, traipse, triples