The word loathsomeness 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: 20
Highest Scoring Words With Friends™ Play In The Letters loathsomeness
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Seven Letter Word Alert: (73 words)
anthems, ashless, assents, enamels, enolase, enolate, enseals, ethanes, ethanol, hamlets, hassles, hastens, hatless, helmets, hostels, hostess, hotness, laments, lassoes, lateens, leanest, leantos, leashes, lessens, lessons, loathes, loosens, loosest, maltose, manhole, manless, mantels, mantles, meanest, measles, menthol, methane, molests, moolahs, nestles, netless, oleates, omelets, osselet, osteoma, osteons, salmons, saloons, sateens, seamost, seasons, senates, sensate, sesames, shmoose, slashes, sloshes, smashes, smooths, someone, sonless, soonest, soothes, stamens, stanols, stashes, stenose, tassels, tealess, teasels, toeless, toolman, toolmen