The word moonlighter 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™ Play In The Letters moonlighter
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Seven Letter Word Alert: (36 words)
emoting, emotion, enlight, gremlin, hooting, hormone, hotline, ionomer, leghorn, legroom, lighten, lighter, looming, loonier, looting, melting, menthol, mingler, mitogen, molting, mongrel, monitor, moonlit, moorhen, mooring, mooting, motlier, relight, retinol, ringlet, rooming, rooting, tingler, tooling, toolmen, tremolo