The word triumvirates 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 triumvirates
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Seven Letter Word Alert: (58 words)
airiest, airtime, armrest, arrives, artiest, artsier, astuter, atriums, attirer, attires, erratum, imitate, iratest, irisate, marries, matters, maturer, matures, metrist, misaver, mistier, mitiest, muriate, mustier, mutates, mutters, ratters, rattier, restart, retrims, revisit, revuist, rustier, ruttier, siriema, situate, smarter, smartie, smatter, starter, starver, stative, stature, stivier, stratum, striate, striver, tarries, tastier, trimers, tritium, trivets, truster, turrets, uveitis, veritas, virtues, vitiate