The word microsecond 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 microsecond
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Seven Letter Word Alert: (48 words)
ceroids, cinders, codices, coiners, comedic, comedos, concise, concord, condoms, condors, cordons, cornice, crimson, cronies, crooned, demonic, discern, dominos, doormen, dormice, erosion, incomer, incomes, indoors, indorse, ionomer, meconic, microns, mincers, minders, miscode, misdoer, misdone, moderns, monoids, moodier, moronic, nimrods, noisome, nordics, omicron, recoins, reminds, rescind, rosined, sconced, scorned, sodomic