The word preponderant 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: 21
Highest Scoring Words With Friends™ Play In The Letters preponderant
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Seven Letter Word Alert: (51 words)
adepter, adopter, adorner, dropper, eardrop, endnote, neonate, nondate, nondeep, notepad, operand, operant, operate, ornater, papered, paperer, partner, pendant, pendent, pentane, pentode, peptone, portend, praetor, predate, prenote, prepare, prepend, pretape, pretend, pronate, propane, propene, prorate, protean, rapport, readopt, readorn, redrape, redtape, repaper, reraped, retaped, retrade, retread, tapered, taperer, terrane, trapped, trapper, treader