The word permanently 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: 22
Highest Scoring Words With Friends™ Play In The Letters permanently
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Seven Letter Word Alert: (31 words)
amylene, aplenty, empanel, emplane, enteral, eternal, lamprey, lantern, payment, penalty, penname, pentane, pentyne, planner, planter, plenary, prelate, prelaty, premelt, pteryla, remnant, repanel, replane, replant, replate, repleat, tannery, tapemen, tempera, trample, yealmer