The word garrulousness 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: 19
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (65 words)
anglers, arguers, arouser, arouses, assures, augurer, engross, ensouls, gaolers, garners, gaseous, gasless, gassers, glasses, glosser, glosses, gnarler, granule, grasses, groaner, grosser, grosses, grouser, grouses, gunless, gurners, languor, langurs, largess, lassoer, lassoes, lessons, lessors, loaners, lounger, lounges, neurula, nursers, oarless, oranger, oranges, orleans, rangers, reasons, regloss, regular, regulon, reloans, rongeur, seasons, sensors, sensual, slogans, snarers, snarler, snorers, soarers, sonless, sorrels, sugarer, sunless, surgeon, surgers, surreal, unseals