The word storekeepers 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: 19
Highest Scoring Words With Friends™ Plays In The Letters storekeepers
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Seven Letter Word Alert: (37 words)
keepers, ketoses, pesters, poetess, porkers, porters, posters, presets, presort, presser, reekers, reperks, reports, reposer, reposes, reposts, repress, reseeks, resorps, resorts, respoke, respots, resteps, resters, restoke, restore, retrees, rosters, seekers, sorters, steeper, steerer, stereos, stokers, stroker, strokes, teepees