The word nightmares 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 nightmares
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Seven Letter Word Alert: (87 words)
aigrets, anthems, anthers, antsier, argents, arshine, artsmen, atheism, enigmas, erasing, gainers, gaiters, gamiest, garment, garnets, garnish, gastrin, gathers, gnasher, granite, haemins, hairnet, hamster, hangers, harming, hastier, hearing, heating, hermits, hernias, imagers, ingrate, inmates, magnets, mangers, mangier, margins, marines, martens, martins, mashing, matings, megahit, meshing, migrant, migrate, minaret, mintage, minters, mirages, mishear, nastier, ragtime, raiment, ratings, reaming, regains, rehangs, remains, remints, resight, restain, resting, retains, retinas, seaming, searing, seating, seminar, shaming, sharing, sighter, sigmate, sirname, smarten, smartie, stagier, stainer, staring, stinger, strange, tangier, tarnish, teaming, tearing, teasing, triages