The word discoloured 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: (36 words)
ceroids, clodder, closure, clouded, coddler, coddles, colours, coolers, coursed, creosol, croodle, cruised, cuddies, cuddler, cuddles, curdled, curdles, decolor, dildoes, discord, doodler, doodles, drooled, lousier, orioles, recoils, riddles, ruddies, scolded, scolder, scoured, sluiced, sluicer, soddier, soldier, sourced