The word blastematic 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: 21
Highest Scoring Words With Friends™ Play In The Letters blastematic
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Seven Letter Word Alert: (39 words)
abettal, ablates, actable, albites, ambsace, amiable, astilbe, batlets, battles, bimetal, blastic, calmest, cambial, cambist, castile, cattail, citable, climate, elastic, labiate, laciest, lactase, lactate, lambast, latites, lattice, libates, malaise, malices, metical, saltate, saltcat, satiate, statice, tablets, tactile, tamable, tamales, timbale