The word onomatopoeias 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: 20
Highest Scoring Words With Friends™ Play In The Letters onomatopoeias
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Seven Letter Word Alert: (33 words)
amentia, amnesia, anapest, animate, animose, atomise, atonias, emotion, impasto, inmates, isotope, moisten, mopiest, motions, naptime, noisome, opiates, options, osteoma, panties, pastime, patinae, patinas, patines, peasant, pimento, postman, postmen, potions, stamina, tampons, tapeman, toonies