The word parallelopiped is playable in Words With Friends™, but 1 blank substituting for the letter 'p' is 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 parallelopiped
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Seven Letter Word Alert: (38 words)
apparel, applied, applier, areolae, deplore, dialler, dipolar, doppler, epipole, lapeled, leopard, lipread, papered, papilla, paroled, pearled, peopled, peppier, periled, pleader, ploidal, plopped, pollard, predeal, predial, preload, prepaid, prepped, propped, rallied, redpole, redpoll, reoiled, repiled, repiped, replead, replied, rippled