The word understudies 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™ Plays In The Letters understudies
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Seven Letter Word Alert: (94 words)
deniers, densest, denture, denuder, denudes, derides, deserts, desired, desires, dessert, destine, detinue, detrend, detrude, detuned, detuner, detunes, diester, dieters, dissent, distend, disused, dresden, dressed, dunites, dusters, dustier, endured, endures, ensuite, ensured, ensures, entries, erudite, inserts, insured, insures, intrude, nesters, neuters, nudists, nutseed, nutsier, reddens, reddest, redness, reedits, reissue, renests, resends, resents, resided, resides, residue, retuned, retunes, reunite, ruddies, rudites, seitens, senders, sestine, sinters, snidest, sterned, strides, studied, studier, studies, suddens, sudsier, suiters, sunrise, sutured, sutures, teddies, tenders, tenured, tenures, tinders, tissued, trended, tressed, trienes, trussed, undress, undrest, undried, uniters, unreset, unrests, untired, untried, uterine