The word chartless 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (34 words)
actress, archlet, artless, carless, cartels, cashers, casters, castles, chalets, chasers, chaster, clarets, clasher, clashes, crashes, halters, hatless, larches, lashers, latches, lathers, rashest, recasts, reclass, sachets, satchel, scalers, scarlet, scathes, scleras, slasher, slaters, slather, trashes