The word convalescents 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: 26
Highest Scoring Words With Friends™ Play In The Letters convalescents
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Seven Letter Word Alert: (75 words)
accents, accosts, acetone, alcoves, alecost, ascents, cacolet, cancels, canteen, cantles, cantons, castles, cenotes, cleanse, cleaves, closest, closets, concave, conceal, connect, consent, convect, convene, convent, encases, enclave, enclose, enolase, enolate, enseals, enslave, evocate, lactone, lactose, lancets, lateens, leanest, leantos, leavens, locates, nascent, neatens, neonate, nestles, netless, nonlate, nonsale, noseans, octanes, octaves, octenes, oleates, oneness, osselet, sateens, scalene, sconces, seances, secants, selects, senates, sensate, sleaves, slovens, solaces, solvent, sonnets, stances, stanols, stenose, tealess, teasels, toeless, valence, voteens