The word planimeter 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 planimeter
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Seven Letter Word Alert: (59 words)
ailment, aliment, arenite, emirate, empanel, emplane, emptier, enteral, eternal, impaler, impanel, implant, inepter, latrine, lempira, lineate, maltier, manlier, marlite, matinee, mealier, meatier, meatpie, minaret, mineral, naptime, netmail, painter, palmier, peatier, penlite, pentail, perlite, pertain, plainer, planter, praline, prelate, premelt, primate, raiment, ratline, reliant, repaint, repanel, replait, replane, replant, replate, repleat, reptile, retinal, tapemen, tempera, terpine, trainee, trample, trenail, triaene