The word cornetists 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: 14
Highest Scoring Words With Friends™ Play In The Letters cornetists
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Seven Letter Word Alert: (48 words)
censors, cession, cistern, citrons, cittern, coiners, consist, contest, cornets, cornett, corsets, cosiest, cosines, cotters, cretins, cronies, erotics, escorts, incests, insects, inserts, intorts, norites, nosiest, notices, notists, oecists, orients, recoins, retints, rosiest, section, sectors, seniors, sinters, sitters, snotter, sorties, stetson, stoners, stonier, stories, tensors, tinters, tocsins, tricots, triones, trisect