The word symmetrised 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: 20
Highest Scoring Words With Friends™ Play In The Letters symmetrised
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Seven Letter Word Alert: (34 words)
demerit, demises, demists, deserts, desires, dessert, diester, dieters, dimeter, dimmers, dimmest, immerse, merited, messier, metrise, midterm, misdeem, misters, mitered, reedits, reemits, resides, restems, retimed, retimes, simmers, smiters, stemmed, strides, stymied, stymies, tressed, tridems, trimmed