The word semiquavers 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: 28
Highest Scoring Words With Friends™ Play In The Letters semiquavers
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Seven Letter Word Alert: (31 words)
assumer, esquire, marquee, marques, marquis, masques, masseur, massive, measure, messier, misaver, misuser, quavers, queries, quivers, reissue, requiem, resaves, resumes, revises, seamers, seamier, seriema, siamese, squares, squires, squirms, surmise, ureases, verisms, viruses