The word misestimations 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: 21
Highest Scoring Words With Friends™ Play In The Letters misestimations
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Seven Letter Word Alert: (53 words)
ammines, animism, animist, animose, assents, atomise, atomism, imitate, inmates, inosite, inseams, insists, instate, ionises, meiosis, mimesis, mimosas, miniate, minimas, misaims, mismate, misname, misseat, mission, mistime, mitiest, mitoses, mitosis, mittens, moisten, moments, nosiest, notists, osseins, seamost, seasons, seitans, session, sestina, siestas, simians, smitten, somites, stamens, statins, station, statism, stetson, stimies, stomate, stomies, taoists, tiniest