The word exfiltrating 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: 26
Highest Scoring Words With Friends™ Play In The Letters exfiltrating
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Seven Letter Word Alert: (76 words)
airlift, airline, aligner, axinite, elating, elixing, engraft, exilian, exiling, exiting, failing, fainter, fairing, fattier, fearing, felting, filiate, finagle, fireant, firelit, fitting, flaring, flatten, flatter, flaxier, flexing, fragile, frigate, gelatin, genital, glitter, granite, igniter, inertia, inflate, ingraft, ingrate, intagli, lairing, latrine, leafing, learing, letting, lifting, lignite, lintier, nattier, niftier, nitrate, nitrite, nittier, rafting, railing, ratline, ratting, realign, relaxin, reliant, retinal, rifling, rifting, ringlet, tagline, tailfin, tailing, tangier, taxiing, tearing, tertial, texting, tiering, tilting, tingler, tintier, trenail, triaxle