The word disownments 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 disownments
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Seven Letter Word Alert: (37 words)
demists, dentins, dimness, disowns, dissent, dowsets, endmost, indents, intends, intoned, intones, mention, midtown, midwest, mindset, minnows, misdoes, misdone, miswend, miswent, mitoses, moisten, newtons, nondiet, nosiest, sitdown, snidest, snowmen, somites, sonnets, stomies, tendons, tension, twinned, twonies, winsome, witness