The word streetwalk 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: 18
Highest Scoring Words With Friends™ Play In The Letters streetwalk
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Seven Letter Word Alert: (32 words)
elaters, kestrel, kettles, leakers, letters, rattles, realest, relates, restake, restate, retakes, retaste, retweak, rewalks, settler, skelter, stalker, starlet, startle, stealer, swatter, sweater, swelter, talkees, talkers, trestle, tweaker, walkers, wattles, weakest, wetters, wrestle