The word concurrencies is playable in Words With Friends™, but 1 blank substituting for the letter 'c' is 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 concurrencies
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Seven Letter Word Alert: (44 words)
censure, coercer, coerces, coiners, concern, concise, concurs, corners, cornice, cornier, courier, courser, cronies, crosier, cruiser, curries, eccrine, encores, ensurer, incense, insurer, ironers, necrose, neurons, nonuser, recoins, recures, recurse, reincur, reoccur, rerinse, rescore, rescuer, reunion, runners, runnier, science, scorner, scourer, securer, sincere, sunnier, unicorn, unrisen