The word hindermost 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: 17
Highest Scoring Words With Friends™ Play In The Letters hindermost
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Seven Letter Word Alert: (60 words)
dehorns, dehorts, dishorn, dithers, editors, endmost, ethmoid, hermits, heroins, heroism, hinders, histone, hoisted, homiest, hornets, indorse, inshore, mentors, meronts, methods, minders, mindset, minters, misdoer, misdone, moderns, moisten, moister, monster, mordent, mortise, mothers, nimrods, norites, orients, reminds, remints, rodents, roisted, rosined, shirted, shorted, shorten, shrined, smother, snorted, sortied, steroid, stonier, storied, stormed, thermos, thiones, thorned, throned, thrones, tierods, tinders, tridems, triones