The word convalescences is playable in Words With Friends™, but 1 blank substituting for the letter 'c' is 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™ Plays In The Letters convalescences
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Seven Letter Word Alert: (27 words)
alcoves, cancels, cleanse, cleaves, concave, conceal, convene, elevens, encases, enclave, enclose, enolase, enseals, enslave, essence, leavens, nonsale, noseans, oneness, scalene, sconces, seances, sleaves, sleeves, slovens, solaces, valence