The word posterboard 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 posterboard
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Seven Letter Word Alert: (72 words)
aborted, aborter, adopter, adorers, arbored, barters, bedpost, bedrops, bedropt, boarder, boasted, boaster, boaters, boosted, booster, booters, borates, borders, broader, brooder, darters, debtors, departs, deports, drapers, eardrop, optrode, orators, parrots, petards, poorest, porters, praetor, praters, presort, probate, probers, prorate, raptors, readopt, reboard, reboast, reboost, reboots, redroot, reports, reroast, reroots, restrap, retards, retraps, roasted, roaster, roosted, rooster, rooters, seaboot, seaport, sorbate, sparred, spoored, sported, starred, stooped, stooper, strobed, tabooed, torpedo, torpors, traders, trooped, trooper