The word derecognised 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (87 words)
ceroids, cinders, codding, codeine, codgers, codings, cognise, coiners, cording, coreign, cringed, cringes, cronies, decenes, decider, decides, decoder, decodes, decreed, decrees, decried, decries, deeding, degrees, deicers, deniers, denoise, derides, descend, desired, diocese, discern, discord, dodgers, dodgier, dredges, dresden, encoded, encoder, encodes, encored, encores, endorse, eroding, genders, generic, godsend, greened, greisen, grinded, groined, ignored, ignores, indorse, necrose, needers, needier, negroes, negroid, nodders, nordics, receded, recedes, recoded, recodes, recoins, reddens, redoing, regions, reigned, reneged, reneges, rescind, resided, rodding, rosined, scoring, scorned, seceded, seceder, sedgier, seedier, seeding, sincere, sneered, soddier, sodding