The word spacewalker 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: 25
Highest Scoring Words With Friends™ Play In The Letters spacewalker
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Seven Letter Word Alert: (38 words)
carpals, carpels, cereals, clasper, clawers, crewels, escaper, kelpers, leakers, leapers, packers, palaces, parcels, peckers, placers, pleaser, presale, reawake, reclasp, relaces, relapse, repaces, repacks, repeals, replace, rescale, respace, respeak, rewalks, scalper, sclerae, skelper, slacker, spackle, sparkle, speaker, speckle, walkers