The word probenecids 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: 22
Highest Scoring Words With Friends™ Plays In The Letters probenecids
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Seven Letter Word Alert: (81 words)
bedrops, bedsore, benders, bendier, binders, binodes, bodices, boreens, ceroids, cinders, codeine, coiners, copiers, crisped, crispen, cronies, deboner, debones, decries, deicers, deniers, denoise, depones, deposer, derbies, diocese, discern, disrobe, ebonics, ebonies, encoder, encodes, encored, encores, endorse, enrobed, enrobes, episode, inbreds, inbreed, indorse, necrose, nordics, obscene, openers, peonies, periods, pierced, pierces, pincers, pioneer, ponders, porcine, prebend, precise, precode, preside, princes, proceed, rebinds, rebonds, recipes, recodes, recoins, reopens, repined, repines, reposed, rescind, rescope, respice, respond, ripened, rosined, scorned, scribed, sincere, sobered, spender, spinode, spondee