The word interrelation 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 interrelation
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Seven Letter Word Alert: (74 words)
aileron, airline, alerter, aniline, antlion, arenite, attirer, earlier, elation, enolate, enteral, entitle, entrain, entrant, entreat, etaerio, eternal, inerter, inertia, intoner, iterate, lantern, latrine, learner, lenient, lineate, lintier, nattier, neonate, nitrate, nitrene, nitrite, nittier, nonlate, nonliar, nonreal, onliner, ornater, otarine, rainier, ratline, rattier, rattler, realter, realtor, reinter, relater, relearn, reliant, retinal, retinol, retitle, retotal, retrain, retreat, retrial, roilier, tearier, tentier, ternate, terrain, terrane, tertial, tinnier, tintier, toenail, torrent, trailer, trainee, trainer, traitor, treater, trenail, triaene