The word supergiant 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 supergiant
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Seven Letter Word Alert: (99 words)
aigrets, airguns, antsier, argents, augites, aunties, engrasp, entraps, erasing, gainers, gaiters, garnets, gaspier, gastrin, gaunter, granite, guineas, guitars, gunters, gustier, gutsier, ingrate, nastier, natures, nutsier, painter, panters, panties, parents, pargets, parings, parsing, parties, parting, pastier, pasting, pasture, patines, pausing, peanuts, pertain, petunia, pingers, pirates, prating, pretans, pterins, puniest, punster, punters, purines, puritan, pursing, rasping, ratings, reaping, regains, reinput, repaint, restain, resting, retains, retinas, reusing, rusting, saunter, searing, seating, sinuate, sparing, stagier, stainer, staring, stinger, strange, stuping, suntrap, tangier, tapings, tearing, teasing, traipse, trepans, triages, turnips, ungrasp, uniters, unpairs, unparse, unstage, unstrap, unstrip, untraps, upraise, uprates, uprisen, upstage, upstair, urinate