The word centenaries 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™ Plays In The Letters centenaries
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Seven Letter Word Alert: (68 words)
aeriest, ancient, antsier, arcsine, arenite, arsenic, canines, cannier, canteen, canters, careens, carnies, catenin, centers, centres, cerates, certain, cistern, creates, cretins, cristae, earnest, eastern, eeriest, ensnare, enteric, enticer, entices, entrain, entrees, entries, incants, incense, insaner, intense, interns, nascent, nastier, nearest, neatens, nectars, nitrene, raciest, recanes, recants, recites, reenact, rennets, restain, retains, retinas, scanner, scanter, scenter, secrete, seriate, sincere, stainer, stannic, sterane, tanners, teenier, tenners, tinners, trainee, trances, triaene, trienes