The word perniciously 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 perniciously
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Seven Letter Word Alert: (80 words)
clerisy, cloners, closeup, closure, cloyers, coiners, copiers, cornily, counsel, coupler, couples, crispen, crisply, cronies, cuisine, elision, elusion, elusory, eosinic, epsilon, incisor, inspire, ioniser, irenics, ironies, leprosy, leprous, lineups, lionise, liriope, lousier, lupines, noisier, noisily, pencils, pincers, piously, pleions, polices, porcine, pouncer, pounces, presync, princes, proline, pronely, psionic, purines, purlins, purloin, pyloric, pylorus, pyrones, reclips, recoils, recoins, recoups, scruple, sericin, silicon, sirloin, sluicer, soupier, spicery, spicier, spicily, spicule, spinier, spinule, splenic, splicer, spoiler, sporule, syncope, unclips, unclose, uncoils, unipole, uprisen, upsilon