The word soldieries 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: 12
Highest Scoring Words With Friends™ Play In The Letters soldieries
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Seven Letter Word Alert: (21 words)
desires, diesels, doilies, dossier, eldress, idolise, iodiser, iodises, lossier, oilseed, reoiled, resides, resoils, resoled, resoles, rodless, sidlers, sliders, soirees, solders, soldier