The word outscoring 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (26 words)
citrons, consort, contour, costing, crouton, cursing, gnostic, incrust, nitrous, ousting, outgrin, outings, riotous, rooting, rousing, routing, rusting, scoring, sooting, sorting, souring, storing, suction, torsion, touring, unstoic