The word ploughshares 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: 23
Highest Scoring Words With Friends™ Play In The Letters ploughshares
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Seven Letter Word Alert: (51 words)
arouses, earplug, gaolers, gapless, gaseous, gashers, gaspers, glosser, gophers, gospels, goulash, grouses, gulpers, gushers, hapless, haulers, hushers, largess, lashers, lassoer, laugher, leprous, oarless, paroles, pergola, perusal, phrases, plagues, plasher, plashes, ploughs, plusher, poseurs, pulsars, pulsers, pushers, regloss, replugs, seahogs, seraphs, shapers, sherpas, slasher, slopers, sloughs, slusher, soapers, splurge, sporule, spousal, spurges