The word barbarousness 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: 21
Highest Scoring Words With Friends™ Play In The Letters barbarousness
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Seven Letter Word Alert: (35 words)
abasers, abraser, abrases, absorbs, abusers, arbours, arouser, arouses, assures, aurorae, auroras, barbers, barrens, bonuses, boranes, brasses, burners, bursars, nursers, reasons, reburns, resnubs, resorbs, robbers, rubbers, seabass, seasons, sensors, snarers, snorers, snubber, soarers, sobbers, subarea, unrobes