The word spermatid 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: 16
Highest Scoring Words With Friends™ Play In The Letters spermatid
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Seven Letter Word Alert: (39 words)
admires, aridest, armpits, aspired, astride, dampers, dampest, departs, despair, diapers, disrate, imparts, misdate, misread, parties, pastier, pastime, permits, petards, pirated, pirates, praised, primase, primate, readmit, restamp, sidearm, smarted, smartie, spirted, stamped, stamper, striped, tampers, tirades, traipse, tramped, tridems, tripeds