The word onomatopoeical 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: 25
Highest Scoring Words With Friends™ Play In The Letters onomatopoeical
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Seven Letter Word Alert: (72 words)
aconite, aeolian, ailment, alicant, aliment, aloetic, amentia, anaemic, anaptic, animate, campion, capital, capitol, captain, caption, climate, coalite, coalman, coalmen, coalpit, coatman, compile, compote, coolant, copilot, ectopia, elation, emotion, impanel, implant, inplace, lactone, laminae, lampoon, lection, manacle, metical, monocle, monocot, moonlit, naptime, nematic, nepotal, nepotic, netmail, oatmeal, opaline, optical, optimal, paceman, palmate, panicle, patinae, pelican, pemican, pentail, picante, pimento, placate, planeta, platoon, plicate, polecat, polemic, potamic, tapeman, tapioca, toenail, toolman, toolmen, topical, topline