The word factorizing 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: 29
Highest Scoring Words With Friends™ Play In The Letters factorizing
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Seven Letter Word Alert: (20 words)
carting, coating, crating, crazing, faction, fairing, fiction, forcing, frantic, ignitor, infarct, ingraft, orating, organic, rafting, rifting, rioting, tracing, zingari, zingaro