The word overburdening 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 overburdening
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Seven Letter Word Alert: (77 words)
bedouin, bedvein, beguine, bendier, bending, berried, bonding, bonnier, bounden, bounder, bourgie, bringer, burgeon, burning, burring, deboner, deriver, dernier, diverge, droning, dungeon, endogen, engined, enrobed, enrober, environ, eroding, evening, genuine, grieved, griever, grinder, grinned, grinner, groined, guerdon, ignored, inbound, inbreed, inuendo, needing, negroid, nerdier, nervier, nerving, nondrug, overbid, overdub, overdue, overrid, overrun, rebegin, rebegun, rebored, rebound, redoing, redrive, reeving, regrind, reguide, reigned, reigner, rending, reunion, reurged, rivered, rongeur, rounder, runnier, unboned, undergo, undoing, unnerve, unrobed, veering, vending, verdure