The word melanoderma 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: 20
Highest Scoring Words With Friends™ Play In The Letters melanoderma
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Seven Letter Word Alert: (25 words)
adenoma, adrenal, alamode, alarmed, almoner, amender, areolae, armload, demerol, earldom, earmold, emendal, emerald, leadman, learned, lemoned, mandrel, manmade, meander, modeler, reamend, remodel, renamed, roadman, roadmen