The word silhouetted 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: 16
Highest Scoring Words With Friends™ Play In The Letters silhouetted
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Seven Letter Word Alert: (34 words)
delouse, dilutes, dittoes, doltish, dotiest, dottles, duelist, heisted, hideous, hideout, hoisted, holiest, hostile, hustled, loudest, loutish, lutites, oilseed, outlets, outlies, outside, settled, shotted, shouted, shuttle, slitted, slotted, stilted, tedious, teleost, thistle, toilets, toluide, tousled