The word ionospheres 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: 17
Highest Scoring Words With Friends™ Plays In The Letters ionospheres
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Seven Letter Word Alert: (46 words)
erosion, heiress, heroine, heroins, heroise, hipness, honoree, hosiers, inshore, iphones, noosers, onshore, openers, operons, penises, peonies, persons, phonier, phonies, pioneer, poesies, poisons, poroses, porosis, prisons, rehones, reopens, repines, reposes, reshine, reships, reshoes, respins, rosehip, seniors, shiners, shrines, siphons, snipers, snooper, soirees, sooners, sphenes, spheres, spinose, sponsor