The word shortbread 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: 16
Highest Scoring Words With Friends™ Play In The Letters shortbread
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Seven Letter Word Alert: (46 words)
aborted, aborter, adorers, arbored, barters, bathers, boarder, boasted, boaster, boaters, borates, borders, bothers, brasher, breadth, breaths, broader, brother, darters, dearths, debtors, dehorts, earshot, harbors, hardest, hatreds, hoarder, hoarser, hotbeds, rebaths, reboard, reboast, reroast, retards, rhetors, roasted, roaster, shorted, shorter, sorbate, starred, strobed, threads, traders, trashed, trasher