The word misestimation 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 misestimation
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Seven Letter Word Alert: (47 words)
ammines, animism, animist, animose, atomise, atomism, imitate, inmates, inosite, inseams, instate, ionises, meiosis, mimesis, mimosas, miniate, minimas, misaims, mismate, misname, misseat, mission, mistime, mitiest, mitoses, mitosis, mittens, moisten, moments, nosiest, notists, seamost, seitans, sestina, simians, smitten, somites, stamens, statins, station, statism, stetson, stimies, stomate, stomies, taoists, tiniest