The word switchblade 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: 24
Highest Scoring Words With Friends™ Play In The Letters switchblade
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Seven Letter Word Alert: (51 words)
achiest, aitches, albites, alethic, astilbe, baldest, baldish, batched, batches, bewitch, blasted, blastic, castile, castled, chalets, citable, citadel, cladist, clashed, dacites, decabit, declaws, delicts, deltaic, details, dialect, dilates, disable, ditches, elastic, ethical, halides, halites, laciest, latched, latches, libated, libates, satchel, scathed, stabled, swathed, waisted, watched, watches, webcast, whistle, wildcat, wildest, witched, witches