The word handbreadths 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: 22
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (31 words)
abashed, abaters, abraded, abrades, abrased, abreast, anthers, baddest, banters, bartend, bathers, branded, breadth, breaths, danders, dastard, dearths, dharnas, handers, handset, hardens, hardest, hardhat, hatband, hatreds, hearths, rebaths, sandbar, stander, threads, trashed