The word stocktakers is playable in Words With Friends™, but 1 blank substituting for the letter 'k' is 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: 17
Highest Scoring Words With Friends™ Plays In The Letters stocktakers
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Seven Letter Word Alert: (39 words)
actress, arkoses, caskets, casters, castors, coakers, coaster, corsets, costars, costate, cotters, escorts, rackets, recasts, recoats, resoaks, restack, restock, retacks, retasks, retoast, rockets, rotates, sackers, scatter, sectors, skaters, soakers, sockets, stacker, staters, stocker, stokers, streaks, strokes, tackers, taskers, tasters, toaster