The word nailbrushes 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: 19
Highest Scoring Words With Friends™ Play In The Letters nailbrushes
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Seven Letter Word Alert: (56 words)
abseils, abusers, airless, arshine, arshins, bashers, bearish, blueish, blusher, blushes, braises, braless, bruises, brushes, burials, burnish, bushels, bushier, harness, haulers, herbals, hernial, hernias, inhaler, inhales, insular, insures, inulase, lashers, lesbian, nailers, nebular, nebulas, renails, resails, resnubs, ribless, sailers, salines, sensual, serials, shalier, shiners, shrines, silanes, slasher, slusher, suberin, subrail, sunrise, unbales, unbless, unleash, unseals, unshare, urinals