The word banteringly 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 banteringly
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Seven Letter Word Alert: (56 words)
aligner, angrily, antigen, bairnly, bearing, beating, belting, bilayer, blaring, blarney, brangle, braying, byliner, earning, elating, entrain, gelatin, genital, gentian, granite, greatly, inanely, inertly, ingrate, inlayer, irately, lantern, latrine, leaning, learing, liberty, nearing, ranting, ratline, realign, reality, regnant, reliant, relying, renting, retinal, retying, ringlet, tabling, tagline, tangier, tannery, tearily, tearing, tenably, tingler, trenail, triable, yarning, yealing, yeaning