The word spoonerism 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™ Play In The Letters
Seven Letter Word Alert: (29 words)
erosion, imposer, imposes, impress, ionomer, isomers, mispens, mossier, noisome, noosers, oosperm, operons, persons, poisons, poroses, porosis, premiss, prisons, promise, respins, seniors, sermons, simpers, snipers, snooper, somonis, sooners, spinose, sponsor