The word switchblades 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 switchblades
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Seven Letter Word Alert: (84 words)
abscise, abseils, achiest, aidless, aitches, albites, alethic, ascites, ashiest, astilbe, baldest, baldish, batched, batches, bedsits, bewitch, biassed, bisects, blasted, blastic, blissed, cashews, castile, castled, castles, chaises, chalets, chisels, citable, citadel, cladist, clashed, clashes, classed, dacites, decabit, declass, declaws, delicts, delists, deltaic, desalts, desilts, details, dialect, dilates, disable, discase, dissect, ditches, elastic, ethical, halides, halites, hatless, laciest, latched, latches, libated, libates, sachets, satchel, scabies, scathed, scathes, shields, slashed, stabled, stables, stashed, swashed, swathed, swathes, swished, waisted, watched, watches, webcast, whistle, wildcat, wildest, witched, witches, witless