The word symmetrising 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: 23
Highest Scoring Words With Friends™ Play In The Letters symmetrising
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Seven Letter Word Alert: (41 words)
gneissy, igniter, ignites, ingests, ingress, inserts, interim, messing, mimesis, minters, mintier, missing, misters, mistier, mistime, misting, remints, resigns, resting, retying, rimming, risings, signers, signets, simmers, singers, sinters, smiters, smiting, stimies, stinger, strings, stringy, stymies, syringe, termini, tiering, tigress, timings, triynes, yessing