The word plowshares 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 plowshares
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Seven Letter Word Alert: (28 words)
hapless, howlers, lashers, lassoer, leasows, oarless, paroles, phrases, plasher, plashes, plowers, preshow, prewash, prowess, replows, reshows, seraphs, shapers, sherpas, showers, slasher, slopers, soapers, sprawls, swasher, warless, washers, whalers