The word obliterator 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: 15
Highest Scoring Words With Friends™ Plays In The Letters obliterator
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Seven Letter Word Alert: (36 words)
abettor, aborter, arbiter, attirer, battier, battler, bitrate, bloater, blotter, bottler, brittle, broiler, laborer, libator, orbital, orbiter, otolite, rarebit, ratbite, rattier, rattler, realtor, retotal, retrial, rootlet, rotator, tabooli, terabit, tertial, toolbar, tootler, totable, trailer, traitor, triable, trilobe