The word convalesced 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: 24
Highest Scoring Words With Friends™ Play In The Letters convalesced
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Seven Letter Word Alert: (29 words)
accedes, acnodes, alcoved, alcoves, cadence, cancels, candles, cleaned, cleanse, cleaved, cleaves, concave, conceal, concede, deacons, decanes, descale, elodeas, encased, enclave, enclose, encodes, enolase, enslave, leavens, scalene, sconced, solaced, valence