The word gravediggers 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: (53 words)
adverse, advisee, adviser, arrived, arrives, averred, averser, daggers, dearies, deriver, derives, derries, desirer, deviser, diggers, diverge, diverse, dragger, drivers, evaders, gaggers, girders, graders, gravies, greased, greaser, grieved, griever, grieves, raggier, raiders, readers, readier, readies, rearise, reavers, redrags, redries, redrive, regards, regears, regives, regrade, rereads, resaved, resider, revised, reviser, riggers, rivered, saggier, sedgier, veggies