The word pocketknives is playable in Words With Friends™, but 1 blank substituting for the letter 'k' is 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: 26
Highest Scoring Words With Friends™ Plays In The Letters pocketknives
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Seven Letter Word Alert: (36 words)
cenotes, coesite, covines, entices, epitoke, evinces, inkpots, inkspot, inspect, invects, invokes, ketones, necktie, nepotic, notices, novices, octenes, onestep, openest, pectens, pectins, pectose, pensive, pentose, peonies, pickets, pinkest, pockets, poetics, poetise, pokiest, poteens, section, skeptic, topkick, voteens