The word hydronephrosis 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: 25
Highest Scoring Words With Friends™ Play In The Letters hydronephrosis
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Seven Letter Word Alert: (72 words)
dehorns, dishorn, dispose, dossier, dryness, erosion, heroins, hinders, hipness, honored, honorer, hornier, horsier, hosiers, hosiery, hydrops, hyphens, hypnoid, indoors, indorse, inshore, iphones, ironers, isopods, noosers, nosodes, onshore, operons, ospreys, periods, persons, phished, phisher, phoneys, phonier, phonies, phrensy, poisons, ponders, poroses, porosis, prisons, prosody, pyrones, rehonor, reships, resorps, respins, respond, rinsers, rosehip, rosined, seniors, sensory, shiners, shrined, shrines, siphons, snipers, snooped, snooper, snorers, sooners, spiders, spidery, spindry, spinode, spinose, sponsor, spooned, spoored, syphons