The word derecognises 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 derecognises
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Seven Letter Word Alert: (95 words)
censers, censors, cerises, ceroids, cession, cinders, codeine, codgers, codings, cognise, coiners, cording, coreign, cosigns, cosines, cringed, cringes, cronies, crossed, decenes, decrees, decries, degrees, deicers, deniers, denoise, designs, desires, digress, diocese, discern, dossier, encoder, encodes, encored, encores, endorse, engross, eroding, essence, genders, generic, geneses, genesis, greened, greisen, groined, grossed, ignored, ignores, indorse, ingress, necrose, needers, needier, negroes, negroid, nordics, recedes, recodes, recoins, redness, redoing, regions, reigned, reneged, reneges, rescind, reseeds, resends, resides, resigns, rosined, scoring, scorned, screeds, screens, seceder, secedes, secerns, seconds, sedgier, seeders, seedier, seeding, senders, seniors, signees, signers, signors, sincere, singers, sneered, sodgers, soirees