The word interpellate 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 interpellate
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Seven Letter Word Alert: (57 words)
arenite, enteral, entitle, entreat, eternal, inepter, iterate, latrine, lineate, literal, littler, nattier, nitrate, painter, palette, patient, pattern, peatier, peltate, penlite, pentail, perlite, pertain, pettier, plainer, planter, platter, praline, prattle, prelate, preteen, ratline, reliant, repaint, repanel, replait, replane, replant, replate, repleat, replete, reptile, retinal, retitle, tallier, teenier, tentier, ternate, terpene, terpine, tertial, trainee, treelet, trenail, triaene, triplet, triptan