The word misestimating 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: 22
Highest Scoring Words With Friends™ Play In The Letters misestimating
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Seven Letter Word Alert: (56 words)
ammines, animism, animist, enigmas, gamiest, ignites, imagine, imitate, ingests, inmates, inseams, instate, magnets, maiming, massing, matings, matting, messing, mimesis, miniate, minimas, mintage, misaims, mismate, misname, misseat, missing, mistime, misting, mitiest, mittens, sagiest, seaming, seating, seitans, sestina, setting, sigmate, signets, simians, sitting, smegmas, smiting, smitten, stamens, stating, statins, statism, stigmas, stimies, tasting, teaming, teasing, testing, timings, tiniest