The word concessionaires 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: 23
Highest Scoring Words With Friends™ Play In The Letters concessionaires
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Seven Letter Word Alert: (95 words)
acerose, ancress, anionic, arcsine, arsenic, asinine, caisson, cancers, canines, cannier, canoers, canonic, careens, carnies, caseins, casinos, cassons, cassoon, censers, censors, cerises, cession, ciscoes, coarsen, cocaine, coerces, coiners, concern, concise, corneas, cornice, coronas, cosines, creases, cresses, cronies, crosses, eccrine, encases, encores, ensears, ensnare, eosinic, erosion, iciness, incense, incises, incisor, inosine, insaner, ioniser, ionises, ionones, irenics, ironies, necrose, niacins, nicosia, noisier, noosers, noseans, oceanic, oncosis, oneness, osseins, raccoon, racoons, raisins, reasons, recanes, recoins, rescans, sassier, scanner, science, scissor, sconces, scoriac, scoriae, scorias, screens, seances, seasons, secerns, seniors, sensors, sericin, session, siennas, sincere, sinners, sissier, soccers, soirees, sooners