The word exponentiations 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: 28
Highest Scoring Words With Friends™ Play In The Letters exponentiations
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Seven Letter Word Alert: (80 words)
annexes, annexin, anoints, asinine, axinite, axstone, epoxies, expanse, expiate, exposit, extents, inosine, inosite, instant, instate, intense, intents, intones, ionones, isotope, nannies, nations, neatens, neatest, neonate, ninepin, nonanes, nonenes, nonsane, nonstop, notions, onestep, openest, opiates, opinion, options, panties, patents, patient, patines, patties, pennant, pennies, pension, pentane, pentose, peonies, petites, pianist, pieties, pietist, pinenes, pinions, pinnate, poetise, pontine, poteens, potions, potties, poxiest, saponin, septate, sextain, sextant, sixteen, spinnet, station, stipite, tannest, tannins, teapots, tenants, tenpins, tension, tiepins, tiniest, tinpots, tiptoes, toonies, tootsie