The word concertinas 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: 19
Highest Scoring Words With Friends™ Play In The Letters concertinas
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Seven Letter Word Alert: (92 words)
accents, accites, aconite, actions, ancient, anoints, antsier, arcsine, arctics, arsenic, ascetic, atoners, atonics, cancers, canines, cannier, canoers, canonic, canters, cantons, cantors, carnies, cartons, catenin, cations, centric, certain, cistern, citrons, coarcts, coarsen, coaster, cocaine, coiners, conceit, concern, concert, concise, connect, consent, contain, corneas, cornets, cornice, cratons, cretins, cristae, cronies, enactor, entrain, erotica, erotics, incants, insaner, interns, intoner, intones, introns, nascent, nastier, nations, nectars, nonarts, norites, notices, oceanic, octanes, orients, otarine, raciest, rations, recants, recoats, recoins, restain, retains, retinas, scanner, scanter, scoriac, scoriae, section, senator, stainer, stannic, stonier, tanners, tension, tinners, trances, treason, triones