The word concessioners 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: 21
Highest Scoring Words With Friends™ Plays In The Letters concessioners
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Seven Letter Word Alert: (38 words)
censers, censors, cerises, cession, ciscoes, coerces, coiners, concern, concise, cornice, cosines, cresses, cronies, crosses, eccrine, encores, erosion, incense, ionones, necrose, noosers, oncosis, oneness, osseins, recoins, science, scissor, sconces, screens, secerns, seniors, sensors, session, sincere, sinners, soccers, soirees, sooners