The word alternatively 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: 22
Highest Scoring Words With Friends™ Play In The Letters alternatively
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Seven Letter Word Alert: (57 words)
alertly, allayer, alveary, analyte, arenite, arylate, elative, enteral, entitle, entreat, eternal, eviller, evitate, inertly, inlayer, irately, iterate, lateral, latrine, lineate, literal, littler, naively, naivety, nattier, nattily, nitrate, ratline, rattail, reality, reavail, reliant, retally, retinal, retitle, tallier, tearily, tentier, ternate, tertial, trainee, travail, trenail, triaene, valiant, vanilla, variant, variate, variety, veinlet, velaria, veneral, ventral, veteran, vinelet, virally, vitally