The word aftershocks 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 aftershocks
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Seven Letter Word Alert: (60 words)
actress, archfoe, arkoses, cashers, caskets, casters, castors, chafers, chaoses, chasers, chaster, chokers, coakers, coaster, corsets, costars, crashes, earshot, escorts, factors, fathers, forests, forsake, fosters, frescos, hackers, hafters, hotcake, kashers, koshers, rackets, rashest, recasts, recoats, resoaks, restack, restock, retacks, retasks, roaches, rockets, sachets, sackers, scathes, sectors, shakers, shocker, shofars, skaters, soakers, sockets, stacker, stocker, stokers, streaks, strokes, tackers, taskers, torches, trashes