The word disinvestment 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: 23
Highest Scoring Words With Friends™ Play In The Letters disinvestment
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Seven Letter Word Alert: (57 words)
deities, dements, demises, demists, densest, dentine, dentins, dentist, destine, detents, detests, deveins, devests, devises, dieties, dietine, dietist, dimness, dissent, ditties, divests, divines, eminent, emitted, endives, evident, indents, indites, insides, intends, intense, intents, invents, invests, invited, invitee, invites, itemise, itemset, mindset, misedit, mitiest, mittens, nemesis, seitens, sestine, siemens, smitten, snidest, stented, stimied, stimies, stinted, tensest, tidiest, tiniest, visited