The word decolourises 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 decolourises
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Seven Letter Word Alert: (81 words)
celsius, cerises, ceroids, closers, closure, colossi, colours, coolers, coulees, coursed, courses, creoles, creosol, cresols, croodle, crossed, cruised, cruises, curdles, deciles, decolor, decries, deicers, delouse, desires, diesels, diocese, dossier, dousers, duelers, eldress, eluders, escudos, iceless, leisure, lossier, lousier, oilseed, orioles, ossicle, reclose, recluse, recodes, recoils, recused, recuses, reduces, reissue, reoiled, rescued, rescues, resides, residue, reslice, resoils, resoled, resoles, rodless, scolder, scoured, screeds, seclude, secured, secures, seducer, seduces, serious, sidlers, slicers, sliders, sluiced, sluicer, sluices, soirees, solders, soldier, sourced, sources, sucrose, sudsier, ulcered