The word filibusterer 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 filibusterer
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Seven Letter Word Alert: (83 words)
beliefs, berries, bitsier, blister, blurter, bluster, briefer, bristle, bruiser, burlers, burlier, bustier, bustler, butlers, febrile, felsite, ferrets, ferries, ferrite, fertile, fibrils, fibrise, fibster, fierier, filbert, filters, firelit, fistule, flirter, fluster, fluters, frisbee, fuelers, furlers, furries, fusible, lefties, leisure, lifters, lustier, rebites, rebrief, rebuilt, reburst, refiles, refires, reflies, refrets, refries, refuels, refurls, refuser, refuter, refutes, reifier, reifies, reliefs, reliers, restful, retiles, retires, retries, riblets, riflers, risible, rustier, rustler, rutiles, siltier, sterile, stifler, subtler, subtree, sulfite, surfeit, surlier, trebles, treeful, trifler, trifles, turfier, ureters, utilise