The word breastplate 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: 18
Highest Scoring Words With Friends™ Play In The Letters breastplate
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Seven Letter Word Alert: (66 words)
abaters, abettal, abetter, ablates, abreast, aerates, arblast, batlets, batters, battler, battles, beaters, berates, betters, blaster, bleater, eatable, elaters, leapers, letters, palates, paleate, palette, palters, parable, patters, peltate, pelters, petrels, plaster, platers, platter, pleaser, prattle, prelate, presale, pretest, rattles, realest, rebales, rebates, reblast, relapse, relates, repaste, repeals, repeats, replate, repleat, respelt, restate, retapes, retaste, saltate, septate, settler, spatter, stabler, stapler, starlet, startle, stealer, tablets, tapster, trebles, trestle