The word irrelevantly 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: 21
Highest Scoring Words With Friends™ Plays In The Letters irrelevantly
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Seven Letter Word Alert: (57 words)
alerter, alertly, arenite, averter, earlier, elative, enteral, eternal, eviller, inerter, inertly, inlayer, irately, latrine, learner, lineate, literal, naively, naivety, nervier, ratline, reality, realter, reentry, reinter, relater, relayer, relearn, reliant, retally, retinal, retrain, retrial, revelry, reviler, rivalry, riveter, tallier, tearier, tearily, ternary, terrain, terrane, trailer, trainee, trainer, trenail, triaene, variety, veinlet, veneral, ventral, veteran, vinelet, virally, vitally, yearner