The word permanents 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: 18
Highest Scoring Words With Friends™ Play In The Letters permanents
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Seven Letter Word Alert: (41 words)
amperes, artsmen, earnest, eastern, ensnare, entraps, manners, martens, meanest, nearest, neatens, panters, parents, penname, penners, pentane, present, pretans, remates, remnant, renames, rennets, repaste, repeats, repents, restamp, retapes, reteams, serpent, smarten, spanner, stamper, steamer, sterane, tampers, tanners, tapemen, tempera, tempers, tenners, trepans