The word alliteratively 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: 23
Highest Scoring Words With Friends™ Plays In The Letters alliteratively
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Seven Letter Word Alert: (32 words)
alertly, allayer, alveary, arylate, elative, eviller, evitate, ilvaite, irately, iterate, lateral, levelly, literal, littler, rattail, reality, reavail, retally, retitle, tallier, tearily, tertial, travail, trivial, variate, variety, veilier, velaria, virally, vitally, vitelli, vitiate