The word tenaciously 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: 19
Highest Scoring Words With Friends™ Play In The Letters tenaciously
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Seven Letter Word Alert: (91 words)
acetyls, acolyte, aconite, actions, acutely, acyloin, alecost, aloetic, atonics, auction, aunties, autoecy, cantles, castile, cations, cauline, caution, celosia, clients, coalise, coalite, consult, cotylae, cotyles, counsel, cutline, cyanise, cyanite, cyanose, cystine, elastic, elastin, elation, eluants, elusion, elution, entails, eustacy, inocyte, instyle, inulase, isolate, laciest, lactone, lactose, lancets, latency, layouts, leantos, lection, lionets, locates, lucites, lunates, lunatic, luniest, nailset, nastily, notices, nutcase, octanes, octynes, oculist, oilcans, outlays, outlies, outline, outsail, saintly, salient, saucily, scantly, sealion, section, sinuate, society, stencil, stoical, stonily, stylion, suction, sulcate, toenail, toucans, unclose, unclots, uncoils, unlaces, unsilty, unstoic, utensil