The word exponentially 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: 29
Highest Scoring Words With Friends™ Play In The Letters exponentially
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Seven Letter Word Alert: (42 words)
antlion, anxiety, aplenty, elation, elixate, enolate, epitaxy, expiate, explain, explant, exploit, inanely, ineptly, lanolin, lenient, lineate, neonate, neotype, nepotal, nonlate, nonleap, nonplay, opaline, penalty, penlite, pentail, pentane, pentyne, petiole, pinnate, plainly, playlet, poleaxe, pollaxe, pontine, ptyalin, toenail, tonally, topline, xennial, xylenol, xylitol