The word semifinalist 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 semifinalist
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Seven Letter Word Alert: (57 words)
ailment, aimless, aliment, animist, elastin, elitism, enlists, entails, falsest, famines, fastens, fatness, fiestas, filiate, filmise, filmset, finales, finials, finless, fissile, fitness, ileitis, infests, inflame, inflate, initial, inmates, inseams, laments, leftism, liaises, listens, manless, mantels, mantles, militia, miniate, misfile, misfits, misseat, missile, nailset, netmail, salient, salines, seitans, seminal, sestina, silanes, silents, simians, similes, stamens, stifles, stimies, tailfin, tinsels