The word exponentials 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: 25
Highest Scoring Words With Friends™ Play In The Letters exponentials
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Seven Letter Word Alert: (91 words)
alpeens, alpines, annexes, anoints, antlion, aplites, apostle, axstone, elastin, elation, elixate, enolase, enolate, entails, epistle, epoxies, epsilon, expanse, expiate, explain, explant, exploit, exposal, exposit, intense, intones, isolate, lateens, leanest, leantos, lenient, lenites, leptons, lineate, linnets, lionets, nailset, nations, neatens, neonate, nepotal, nonlate, nonleap, nonsale, nonslip, oleates, onestep, opaline, openest, opiates, oxalise, oxtails, panties, patines, pelites, penlite, pennies, pension, pentail, pentane, pentose, peonies, petiole, pilates, pinenes, pinnate, planets, pleions, poetise, poleaxe, pontine, poteens, poxiest, salient, salpinx, saponin, sealion, sealpox, sextain, sextile, sixteen, spaniel, spelean, spinnet, tenpins, tensile, tension, toenail, topline, topsail, xennial