The word spermophilus 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 spermophilus
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Seven Letter Word Alert: (94 words)
emulsor, heliums, heroism, hoppers, hoppler, hopples, hosiers, humpers, humpies, implore, imposer, imposes, impress, impulse, isohels, isomers, leprous, lispers, loppers, lossier, lousier, lumpier, lumpish, misrule, misuser, moppers, morsels, mossier, mousers, mousier, mueslis, mushers, mushier, oppress, pileups, pimples, plumier, plumose, plumper, plusher, poseurs, prelims, premiss, pressup, promise, propels, pulpers, pulpier, pulsers, pumelos, pumpers, purples, purpose, pushers, pushier, pussier, repumps, reshims, reships, resoils, rimless, ripples, rosehip, rumless, rumples, rumshop, serious, shipper, shopper, shrimps, simpers, simpler, simples, sippers, slipper, slipups, slopers, slusher, smilers, soppers, soppier, soupier, sourish, spoiler, sporule, spumier, suppers, suppler, suppose, surmise, suspire, umpires, uprises, upslope