The word shareholder 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: 17
Highest Scoring Words With Friends™ Play In The Letters shareholder
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Seven Letter Word Alert: (37 words)
adherer, adheres, adorers, areoles, dealers, elodeas, harsher, headers, healder, healers, hearers, hearsed, heralds, herders, hoarder, hoarser, holders, larders, leaders, leashed, loaders, ordeals, readers, realers, rearose, redeals, reheard, rehears, reloads, rereads, reshare, reshoed, reshore, resoled, sheared, shearer, shoaled