The word endeavoring 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 endeavoring
:
Seven Letter Word Alert: (49 words)
adenine, adoring, andiron, aneroid, angered, avenged, avenger, avoider, darning, deaving, deraign, derange, diverge, dogvane, droning, earning, endogen, engined, engrave, enraged, environ, eroding, evading, evening, grained, grenade, grieved, grinned, groaned, groined, ignored, invader, ironage, nearing, needing, negroid, nerving, overage, reading, reaving, redoing, reeving, reigned, rending, roaning, vearing, veering, vending, vinegar