The word acceleration 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: 20
Highest Scoring Words With Friends™ Play In The Letters acceleration
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Seven Letter Word Alert: (72 words)
accrete, acerate, acetone, aconite, aeolian, aileron, alicant, aloetic, arenite, areolae, article, cacolet, calcine, calcite, caloric, calorie, carinae, carinal, central, centric, certain, circlet, clarion, cleaner, cloacae, coalier, coalite, coaltar, cocaine, coeliac, conceal, conceit, concert, conical, corneal, cornice, coterie, cranial, eccrine, elation, elector, enactor, enolate, enteral, enteric, enticer, erotica, etaerio, eternal, laconic, lactone, latrine, lectern, lection, licence, lineate, oceanic, otarine, ratline, recital, reclean, recline, reclone, reenact, reliant, retinal, retinol, toenail, trainee, treacle, trenail, triaene