The word triskelion 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 triskelion
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Seven Letter Word Alert: (37 words)
elision, estriol, inkiest, inosite, iolites, ioniser, ironies, kilters, kirtles, linkers, lintier, lionets, lionise, loiters, noisier, norites, nostril, oiliest, oilskin, orients, reknits, reknots, relinks, retinol, silkier, siltier, sinlike, sirloin, snorkel, sonlike, stinker, stonier, tinkers, tinkler, tinkles, toilers, triones