The word underskirts 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: 18
Highest Scoring Words With Friends™ Play In The Letters underskirts
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Seven Letter Word Alert: (56 words)
diesunk, dissent, drinker, drunker, dunites, duskier, dusters, dustier, inserts, insured, insurer, insures, intrude, kindest, knurred, nudists, nursers, nutsier, reknits, restirs, returns, rinsers, riskers, rudites, runtier, rustier, sinkers, sinters, skirted, snidest, stinker, stirred, strider, strides, striker, strikes, studier, studies, sudsier, suiters, sunrise, tinders, tinkers, tissued, trunked, trussed, turners, turrids, tuskers, undress, undrest, uniters, unrests, unskied, untired, untried