The word decorousness 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: (61 words)
censers, censors, censure, condors, cordons, coursed, courses, cresses, crooned, crossed, crosses, crunode, cussers, dousers, dresses, encoder, encodes, encored, encores, endorse, endures, ensured, ensures, escudos, necrose, noosers, nosodes, onerous, osseous, recodes, recused, recuses, redness, reduces, rescued, rescues, resends, resound, scorned, scoured, screeds, screens, secerns, seconds, secured, secures, seducer, seduces, senders, sensors, sooners, sounder, sourced, sources, sucrose, sudsers, uncords, uncored, uncross, undoers, undress