The word opacifications 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 opacifications
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Seven Letter Word Alert: (31 words)
actinic, actions, anaptic, atonias, atonics, caftans, capstan, captain, caption, cations, catnaps, catnips, cocopan, confits, faction, fanatic, fiction, finspot, iconist, nicosia, oncotic, options, pacific, patinas, pianist, picnics, potions, psionic, satanic, sciatic, tapioca