The word storefronts 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: 15
Highest Scoring Words With Friends™ Plays In The Letters storefronts
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Seven Letter Word Alert: (30 words)
festoon, footers, forests, fosters, froster, noosers, osteons, reroofs, reroots, resorts, retorts, roofers, rooster, rooters, rosters, rotters, snorers, snorter, snotter, softens, softest, sooners, soonest, sorters, stetson, stoners, tensors, tooters, tornote, torrent