The word earthshaking 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: (91 words)
against, agatine, agatise, aigrets, anthers, antsier, argents, arshine, artisan, atresia, eartags, eighths, erasing, gainers, gaiters, garnets, garnish, gastrin, gathers, gherkin, gnasher, granite, hairnet, hangars, hangers, hankers, hankies, harkens, harking, hashing, hashtag, hastier, hearing, hearths, heating, heights, hernias, highest, ingrate, intakes, karites, keratin, knights, nastier, rainhat, rankest, ratings, reaking, regains, rehangs, reknits, resight, restain, resting, retains, rethank, rethink, retinas, sangria, searing, seating, shakier, shaking, sharing, shitake, sighter, sinkage, skating, snakier, stagier, stainer, staking, staring, stinger, stinker, strange, takings, tanager, tangier, tankage, tankers, tarnish, tasking, teargas, tearing, teasing, thanker, thinker, tinkers, triages, tsarina