The word seminiferous 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 seminiferous
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Seven Letter Word Alert: (52 words)
ensures, fermion, finesse, firemen, firmoss, fission, fissure, foremen, forseen, fusions, fussier, informs, infuser, infuses, infusor, insures, ioniser, ionises, ironies, isomere, isomers, meioses, meiosis, messier, minuses, misfire, mission, misuser, mossier, mousers, mousier, nemesis, noisier, refines, refuses, reifies, reissue, remines, resumes, ruesome, seniors, serious, sermons, siemens, soirees, sunrise, surmise, unforms, unifier, unifies, uniform, urnmoss