The word iridescences 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: 20
Highest Scoring Words With Friends™ Play In The Letters iridescences
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Seven Letter Word Alert: (39 words)
censers, cerises, cinders, decenes, decrees, decries, deicers, deniers, desires, discern, eccrine, essence, iciness, incised, incises, indices, insider, insides, irenics, needers, needier, recedes, redness, rescind, reseeds, resends, resides, science, screeds, screens, seceder, secedes, secerns, seeders, seedier, senders, sericin, sincere, sneered