The word spermatids 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: 17
Highest Scoring Words With Friends™ Play In The Letters spermatids
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Seven Letter Word Alert: (73 words)
admires, aridest, armpits, aspired, aspires, astride, dampers, dampest, demasts, demists, departs, despair, diapers, disarms, disrate, imparts, impasse, impress, masters, misdate, misread, misseat, misstep, misters, paresis, parties, pasters, pastier, pasties, pastime, permits, persist, petards, pirated, pirates, praised, praises, premiss, priests, primase, primate, rapists, readmit, repasts, restamp, satires, sidearm, simpers, smarted, smartie, smiters, spaders, sparest, spasmed, spiders, spireas, spirted, spreads, spriest, sprites, stamped, stamper, streams, strides, striped, stripes, tampers, tirades, traipse, tramped, tridems, tripeds, tsarism