The word incinerator 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 incinerator
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Seven Letter Word Alert: (26 words)
aconite, ancient, anionic, cannier, carrion, catenin, certain, citrine, contain, cornier, creator, enactor, entrain, erotica, erratic, inciter, inertia, intoner, ornater, otarine, rainier, reactor, retrain, terrain, tinnier, trainer