The word derecognise 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (59 words)
ceroids, cinders, codeine, codgers, codings, cognise, coiners, cording, coreign, cringed, cringes, cronies, decenes, decrees, decries, degrees, deicers, deniers, denoise, diocese, discern, encoder, encodes, encored, encores, endorse, eroding, genders, generic, greened, greisen, groined, ignored, ignores, indorse, necrose, needers, needier, negroes, negroid, nordics, recedes, recodes, recoins, redoing, regions, reigned, reneged, reneges, rescind, rosined, scoring, scorned, seceder, sedgier, seedier, seeding, sincere, sneered