The word beastliness 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: 16
Highest Scoring Words With Friends™ Play In The Letters beastliness
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Seven Letter Word Alert: (52 words)
abseils, absents, albites, assents, astilbe, baleens, bassets, bassist, beanies, biasses, blesses, blisses, easiest, elastin, enables, enlists, enseals, entails, lassies, lateens, leanest, lenites, lesbian, lessens, libates, lineate, listens, nailset, nestles, netless, salient, salines, sateens, seitans, seitens, senates, sensate, sessile, sestina, sestine, siestas, silanes, silents, sinless, stables, tassels, tealess, teasels, tenable, tensile, tieless, tinsels