The word solidarities 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: 14
Highest Scoring Words With Friends™ Play In The Letters solidarities
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Seven Letter Word Alert: (97 words)
aidless, airiest, airless, airside, aldoses, aridest, artless, astride, astroid, dailies, dairies, daisies, delator, deliria, delists, derails, desalts, desilts, details, dialers, diaries, diarist, dilater, dilates, dilator, diorite, dirties, disrate, distils, ditsier, doilies, dorsals, dossier, dotless, editors, estriol, idolise, idolist, ileitis, iodiser, iodises, iodites, iolites, iridise, irisate, isolate, lassoed, lassoer, leotard, liaised, liaises, loaders, loiters, lossier, oarless, oiliest, ordeals, ostlers, realist, redials, relists, reloads, resails, resoils, retails, roadies, roasted, rodless, roisted, rosiest, sailers, sailors, saltier, satires, serials, sidelit, sidlers, siltier, slaters, slatier, sliders, solders, soldier, sortals, sortied, sorties, steroid, sterols, storied, stories, strides, tailors, tidiers, tierods, tirades, toilers, trailed