The word unharnessing 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: 20
Highest Scoring Words With Friends™ Plays In The Letters unharnessing
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Seven Letter Word Alert: (59 words)
airguns, anguish, arshine, arshins, earning, ensigns, ensuing, erasing, gainers, garnish, gashers, gassier, geishas, gnasher, gnashes, guanine, guineas, gunners, gushers, gushier, hangers, harness, hearing, hernias, hungers, ingress, insaner, insures, nannies, nearing, nursing, regains, rehangs, rennins, resigns, reusing, running, rushing, sashing, searing, sensing, sharing, shiners, shrines, shunner, siennas, sighers, signers, singers, sinners, snaring, sringas, sunnier, sunnies, sunning, sunrise, unhinge, unrisen, unshare