The word philanderer 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: 19
Highest Scoring Words With Friends™ Play In The Letters philanderer
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Seven Letter Word Alert: (50 words)
adherer, deplane, dernier, drainer, earlier, handier, handler, hardier, harelip, headier, headpin, healder, helipad, heparin, hernial, inhaled, inhaler, lardier, learned, learner, lipread, nerdier, paneled, pearled, periled, pinhead, plainer, pleader, praline, predeal, predial, randier, rapider, readier, redline, redrape, reheard, rehired, relearn, relined, repanel, repiled, repined, repiner, replane, replead, replied, replier, reraped, ripened