The word ploughwrights 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: 29
Highest Scoring Words With Friends™ Play In The Letters ploughwrights
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Seven Letter Word Alert: (22 words)
gothish, growths, hightop, hoggish, hotspur, loutish, outwish, pigouts, plights, ploughs, roguish, slipout, spright, through, troughs, uplight, upright, urolith, wholist, whorish, worship, wrought