The word infinitesimals 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: 23
Highest Scoring Words With Friends™ Plays In The Letters infinitesimals
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Seven Letter Word Alert: (66 words)
ailment, aimless, aliment, aniline, animist, asinine, elastin, elitism, enfants, enlists, entails, falsest, famines, fastens, fatness, fiestas, filiate, filmise, filmset, finales, finials, finless, fissile, fitness, ileitis, infants, infests, inflame, inflate, initial, inlines, inmates, inseams, laments, leftism, liaises, lineman, linnets, listens, manless, mantels, mantles, melanin, militia, miniate, misfile, misfits, misseat, missile, nailset, netmail, salient, salines, seitans, seminal, sestina, siennas, silanes, silents, simians, similes, stamens, stifles, stimies, tailfin, tinsels