The word triennials 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: 13
Highest Scoring Words With Friends™ Plays In The Letters triennials
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Seven Letter Word Alert: (44 words)
airiest, airline, aniline, antlers, antsier, asinine, elastin, ensnarl, entails, entrain, inertia, inlines, insaner, interns, irisate, lantern, latrine, linnets, lintier, nailers, nailset, nastier, ratline, realist, reliant, renails, rentals, reslant, restain, retails, retains, retinal, retinas, salient, saltern, saltier, siltier, slatier, stainer, sternal, tanners, tinners, tinnier, trenail