The word disownment 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 disownment
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Seven Letter Word Alert: (24 words)
dentins, endmost, indents, intends, intoned, intones, mention, midtown, midwest, mindset, minnows, misdone, miswend, miswent, moisten, newtons, nondiet, sitdown, snowmen, tendons, tension, twinned, twonies, winsome