The word nightwalker 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: 24
Highest Scoring Words With Friends™ Play In The Letters nightwalker
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Seven Letter Word Alert: (69 words)
aligner, alright, antlike, elating, enlight, enthral, gawkier, gelatin, genital, gherkin, granite, haglike, hairnet, halting, harking, hawking, healing, hearing, heating, hernial, ingrate, inhaler, keratin, lankier, larking, lathing, latrine, leaking, learing, lighten, lighter, linkage, ratlike, ratline, reaking, realign, reliant, relight, rethank, rethink, retinal, ringlet, taglike, tagline, talking, tangier, tawnier, tearing, thanker, thawing, thinker, tingler, tinkler, tinware, trenail, twanger, twangle, twinkle, walking, wangler, warlike, wearing, welting, whaling, whinger, winglet, winkler, wrangle, wrinkle