The word saltpetres 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: 14
Highest Scoring Words With Friends™ Play In The Letters saltpetres
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Seven Letter Word Alert: (76 words)
artless, asperse, earless, elapses, elaters, estates, leapers, leasers, letters, palette, palters, pastels, pasters, patters, peltate, pelters, pesters, pestles, petless, petrels, plaster, platers, platter, pleaser, pleases, prattle, prelate, presale, presets, pretest, rattles, realest, relapse, relates, repaste, repasts, repeals, repeats, replate, repleat, resales, reseals, reseats, respelt, restate, resteps, retapes, retaste, retests, sealers, seaters, septate, septets, serapes, setters, settler, settles, slaters, sparest, spatter, stalest, stapler, staples, starlet, startle, staters, stealer, streets, tapster, tasters, tealess, teasels, teasers, tersest, testers, trestle