The word voluminousness 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: 26
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (42 words)
elusion, eluvium, emulous, emulsin, ensouls, envious, insoles, ionones, lesions, lessons, lioness, loonies, loosens, minuses, misuses, moulins, mousses, mueslis, muslins, mussels, noisome, nonevil, nonlove, oleosin, ominous, osmosis, osseins, osseous, session, sinless, sinuous, sinuses, slovens, snivels, somonis, sonless, sunless, sunnies, unloose, unveils, venison, volumes