The word endeavouring 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: 22
Highest Scoring Words With Friends™ Play In The Letters endeavouring
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Seven Letter Word Alert: (66 words)
adenine, adoring, aground, andiron, aneroid, angered, avenged, avenger, avoider, darning, deaving, deraign, derange, diverge, dogvane, droning, dungeon, earning, endogen, engined, engrave, enraged, environ, eroding, evading, evening, gaudier, genuine, grained, grenade, grieved, grinned, groaned, groined, guanine, guerdon, ignored, inuendo, invader, ironage, nearing, needing, negroid, nerving, nondrug, overage, overdue, reading, reaving, redoing, reeving, reguide, reigned, rending, reunion, roaning, unaired, undergo, undoing, uneager, unnerve, unvaned, vearing, veering, vending, vinegar