The word interleaving 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™ Play In The Letters interleaving
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Seven Letter Word Alert: (99 words)
airline, aligner, aniline, antigen, arenite, avenger, earning, elating, elative, elegant, engrave, enlarge, enliven, enteral, entrain, eternal, evening, eviting, gelatin, general, genital, gentian, gentile, gentler, gleaner, granite, grantee, greaten, igniter, ilvaite, inertia, ingrain, ingrate, intagli, integer, invitee, inviter, lairing, lantern, latrine, leaning, learing, leaving, leering, lenient, lignite, lineage, lineate, lintier, nailing, nearing, nerving, nitrene, railing, raining, ranting, ratline, reagent, realign, reaving, reeling, reeving, regnant, reining, reliant, renting, retinal, ringlet, tagline, tailing, tangier, tearing, tiering, tingler, tinnier, trainee, treeing, trenail, triaene, trivial, vearing, veering, vegetal, veilier, veiling, veinier, veining, veinlet, veliger, veneral, venting, ventral, veteran, vialing, vinegar, vinelet, vintage, vintner, vitrine