The word caseworkers 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (41 words)
acerose, arkoses, careers, coakers, coarser, corkers, crakers, crasser, creaser, creases, croaker, crosser, erasers, escrows, rackers, reakers, rearose, reawoke, recorks, recower, recross, reracks, rescore, reskews, resoaks, reswear, reswore, reworks, rockers, sackers, scarers, scorers, screwer, seacows, skewers, soakers, soarers, swearer, wearers, workers, wrecker