The word syncretizing 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: 30
Highest Scoring Words With Friends™ Play In The Letters syncretizing
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Seven Letter Word Alert: (39 words)
cistern, citizen, citrine, cretins, cringes, cryings, cygnets, cystine, igniter, ignites, inciter, incites, interns, irenics, nesting, reicing, reining, renting, resting, retying, rinsing, scrying, seizing, sericin, stinger, stringy, syncing, syringe, tensing, tiering, tinners, tinnier, triynes, zesting, zincier, zincing, zincite, zingers, zingier