The word changelings 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: 23
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (32 words)
angelic, angling, canines, cashing, ceasing, changes, channel, chasing, enchain, english, gashing, genials, ginseng, glances, haggles, hanging, healing, inhales, lacings, lancing, lashing, leaning, leasing, leching, lensing, lichens, scaling, sealing, shingle, signage, snaggle, sniggle