The word adherents 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: 13
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (36 words)
adheres, anthers, arsheen, dearest, dearths, earnest, earthed, earthen, eastern, endears, ethanes, handers, handset, hardens, hardest, hatreds, headers, headset, hearsed, hearted, hearten, heaters, nearest, reasted, redates, reheats, sedater, sheared, standee, stander, sterane, sterned, tasered, tenders, threads, trashed