The word birdfeeders 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: 19
Highest Scoring Words With Friends™ Play In The Letters birdfeeders
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Seven Letter Word Alert: (43 words)
bedders, bedside, beefier, berried, berries, bidders, birders, breeder, briefed, briefer, debride, debrief, defiers, derbies, derider, derides, derries, desired, desirer, feeders, ferried, ferries, fibered, firebed, freebie, frisbee, rebreed, rebrief, redried, redries, reedbed, reedier, reefers, reefier, refeeds, refired, refires, refried, refries, resided, resider, seedbed, seedier