The word blastocoelic 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: 23
Highest Scoring Words With Friends™ Plays In The Letters blastocoelic
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Seven Letter Word Alert: (51 words)
accites, albites, alecost, aloetic, ascetic, astilbe, ballets, ballots, betoils, billets, blastic, caboose, cacolet, calcite, calicle, calicos, callose, castile, cellist, celosia, citable, clastic, coalise, coalite, cobalts, coeliac, collate, collect, collies, coolest, cooties, elastic, iceball, iceboat, icecool, isolate, laciest, lactose, libates, lobelia, locales, locates, losable, ocelots, oolites, seaboot, stoical, stoolie, tabooli, tallies, tobacco