The word blunderbusses 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: 24
Highest Scoring Words With Friends™ Play In The Letters blunderbusses
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Seven Letter Word Alert: (53 words)
bedless, bedress, benders, blender, blessed, blesser, blesses, blunder, blurbed, budless, bundles, burbled, burbles, burdens, debuses, dresses, dubbers, duelers, eldress, eluders, enbused, enbuses, endless, endures, ensured, ensures, lenders, lessens, nubbled, nubbles, reblend, rebless, redness, resends, resnubs, rubbles, senders, slender, snubbed, snubber, subduer, subdues, subrule, suburbs, sudsers, sunbeds, sunless, unbless, unblurs, undress, unreels, unruled, useless