The word overemphasise 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 overemphasise
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Seven Letter Word Alert: (97 words)
amorphs, amperes, asperse, aspires, emerses, empires, empress, epimers, episome, erosive, hampers, harpies, heapers, hearses, heavers, heavier, heiress, heroise, heroism, hosiers, impasse, imposer, imposes, impress, improve, isomere, isomers, marshes, mashers, massive, meioses, meshers, meshier, messiah, messier, misaver, mishaps, mishear, mossier, ovaries, oversea, oversee, paresis, passive, peevers, peevish, pheeses, phrases, poesies, praises, preemie, premise, premiss, primase, promise, raspish, reheaps, rehomes, removes, repaves, reposes, resaves, reshape, reshave, reshims, reships, reshoes, revamps, revises, rosehip, saviors, seamers, seamier, seepier, serapes, seraphs, seriema, shapers, sharpie, shavers, sheaves, sherpas, shivers, shovers, shrimps, siamese, simpers, smasher, soapers, soapier, soirees, spheres, spireas, vampire, verismo, verisms, vespers