The word soldierships 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™ Play In The Letters soldierships
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Seven Letter Word Alert: (43 words)
delphis, despoil, dipoles, dispels, dispose, doilies, dossier, hissers, hissier, hissies, holders, hosiers, idolise, iodiser, iodises, isohels, lessors, liriope, lispers, lossier, periods, pisoids, pissier, presold, reships, resoils, rodless, rosehip, shields, sidlers, sissier, sliders, slopers, sloshed, sloshes, sodless, solders, soldier, soliped, spiders, spiroid, spoiled, spoiler