The word undershirts 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: 16
Highest Scoring Words With Friends™ Play In The Letters undershirts
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Seven Letter Word Alert: (56 words)
dissent, dithers, druther, dunites, dusters, dustier, hinders, hirsute, hunters, hurried, hurries, hurters, inserts, insured, insurer, insures, intrude, nudists, nursers, nutsier, restirs, returns, rinsers, rudites, runtier, rushers, rustier, shiners, shirted, shrined, shrines, shunted, shunter, shutins, sinters, snidest, stirred, strider, strides, studier, studies, sudsier, suiters, sunrise, thunder, tinders, tissued, trussed, turners, turrids, undress, undrest, uniters, unrests, untired, untried