The word syncretising 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 syncretising
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Seven Letter Word Alert: (52 words)
cistern, citrine, cretins, cringes, cryings, cygnets, cystine, encysts, ensigns, gneissy, iciness, igniter, ignites, incests, incises, inciter, incites, ingests, ingress, insects, inserts, interns, irenics, nesting, reicing, reining, renting, resigns, resting, retying, rinsing, risings, scrying, sensing, sericin, signers, signets, singers, sinners, sinters, stinger, strings, stringy, syncing, syringe, tensing, tiering, tigress, tinners, tinnier, triynes, yessing