The word needleworkers 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: 23
Highest Scoring Words With Friends™ Play In The Letters needleworkers
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Seven Letter Word Alert: (37 words)
downers, endorse, kernels, kneeled, kneeler, knowers, lenders, lowered, needers, needler, needles, oreweed, reekers, reelers, reendow, renders, renewed, renewer, resewed, resoled, resowed, reswore, rewelds, rewords, reworks, serener, skelder, sleeker, slender, sneered, sneerer, snorkel, weeders, weekend, welders, wonders, workers