The word surrejoinder 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™ Plays In The Letters surrejoinder
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Seven Letter Word Alert: (34 words)
deniers, denoise, dernier, derries, desirer, endorse, endures, ensured, ensurer, indorse, injured, injurer, injures, insured, insurer, ironers, joinder, joiners, juniors, nerdier, orderer, redries, rejoins, renders, reorder, rerinse, resider, residue, resound, rosined, rounder, sorrier, sounder, undoers