The word dreadlocks 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: 20
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (35 words)
caroled, cloaked, clodder, coakers, coalers, coddler, coddles, cradled, cradles, croaked, deodars, dockers, earlock, escolar, ladders, loaders, lockers, oracled, oracles, ordeals, reclads, recloak, recoals, redocks, reloads, relocks, saddler, sarcode, scalded, scolded, scolder, slacked, slacker, solaced, solacer