The word streetwalker 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 streetwalker
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Seven Letter Word Alert: (66 words)
alerter, elaters, kestrel, kettles, leakers, letters, ratters, rattler, rattles, reakers, realers, realest, realter, reekers, reelers, relater, relates, release, restake, restart, restate, reswear, retaker, retakes, retaste, retears, retreat, retrees, retweak, retweet, rewalks, rewater, serrate, settler, skelter, sleeker, stalker, starker, starlet, starter, startle, stealer, steerer, swatter, swearer, sweater, sweeter, swelter, talkees, talkers, tearers, teeters, trawler, treater, treelet, trestle, tweaker, tweeter, walkers, waterer, wattles, weakest, wearers, wetters, wrester, wrestle