The word syncretise 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 syncretise
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Seven Letter Word Alert: (36 words)
censers, centers, centres, cerises, cistern, cresset, cretins, cystine, encysts, enteric, enticer, entices, entries, incests, insects, inserts, nesters, recites, renests, resects, resents, scenery, scenter, screens, screeny, secerns, secrets, seitens, sestine, sincere, sinters, styrene, syenite, trienes, triynes, yestern