The word paperboards 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: 21
Highest Scoring Words With Friends™ Plays In The Letters paperboards
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Seven Letter Word Alert: (26 words)
abrader, abrades, abrased, abraser, adorers, appears, apposed, apposer, arbored, bedrops, boarder, boppers, borders, broader, dappers, drapers, dropper, eardrop, parader, parades, peapods, probers, prosper, rappers, reboard, sparred