The word blastomere 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 blastomere
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Seven Letter Word Alert: (59 words)
abortee, amblers, areoles, armlets, beamlet, beaters, beermat, berates, besmear, blamers, blaster, bleater, bloater, boaster, boaters, boletes, bolster, bolters, borates, bromate, earlobe, elaters, emoters, lobster, maestro, maltose, marbles, melters, meteors, mobster, morales, mortals, oleates, omelets, rambles, realest, rebales, rebates, reblame, reblast, reboast, relates, remates, remelts, remotes, resmelt, reteams, roseate, roselet, smelter, sorbate, stabler, stealer, steamer, stromal, telomer, tramels, trebles, tremble