The word semimonthlies 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 semimonthlies
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Seven Letter Word Alert: (65 words)
elision, elitism, enlists, helmets, hemline, hessite, histone, holiest, homiest, hostels, hostile, hotline, hotness, immense, inosite, insoles, iolites, ionises, isohels, itemise, lenites, lesions, lioness, lionets, lionise, lionism, listens, meioses, meiosis, memento, menthol, mimesis, missile, mission, mistime, mitoses, mitosis, moisten, molests, moments, nemesis, nestles, netless, nosiest, oiliest, omelets, onetime, osselet, seitens, sestine, siemens, silents, similes, somites, stenose, stimies, stomies, stonish, tensile, theisms, thiones, tieless, tinsels, toeless, tonsils