The word convalescing 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: 27
Highest Scoring Words With Friends™ Play In The Letters convalescing
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Seven Letter Word Alert: (64 words)
accinge, agnosic, agonies, agonise, alcoves, angelic, calcine, calicos, calving, cancels, canines, cannoli, canonic, ceasing, celosia, cloning, closing, coaling, coalise, cocaine, coeliac, cognacs, cognise, coinage, concave, conceal, concise, congeal, conical, connive, consign, covines, eloigns, evasion, genials, glances, goalies, lacings, laconic, lancing, leaning, leasing, leaving, legions, lensing, lingoes, loaning, lovages, nanogel, nonevil, nonsale, novices, oceanic, oilcans, salving, scaling, sealing, sealion, slaving, solving, vaccine, venison, vesical, vocalic