The word ringmaster 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (91 words)
aigrets, angrier, antsier, argents, armrest, artsier, artsmen, earring, enigmas, erasing, errants, gainers, gaiters, gamiest, garment, garners, garnets, garrets, garters, gastrin, girners, grainer, granite, granter, graters, grister, imagers, ingrate, inmates, magnets, mangers, mangier, margins, mariner, marines, marries, marring, martens, martins, matings, migrant, migrate, minaret, mintage, minters, mirages, nastier, ragtime, raiment, rangers, rangier, ranters, ratings, reaming, rearing, regains, regrant, remains, remints, restain, resting, retains, retinas, retrain, retrims, ringers, seaming, searing, seating, seminar, sigmate, sirname, smarten, smarter, smartie, stagier, stainer, staring, stinger, strange, tangier, tarries, tarring, teaming, tearing, teasing, terrain, trainer, triages, trigram, trimers