The word pediculosis 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: 20
Highest Scoring Words With Friends™ Play In The Letters pediculosis
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Seven Letter Word Alert: (31 words)
celsius, closeup, coupled, couples, cupless, cuspids, despoil, dipoles, dispels, dispose, doilies, escudos, euploid, idolise, iodises, ossicle, pisoids, ploidic, plussed, policed, polices, sluiced, sluices, soliped, spicule, spliced, splices, spoiled, spoused, suicide, upsides