The word transponder 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: 17
Highest Scoring Words With Friends™ Plays In The Letters transponder
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Seven Letter Word Alert: (72 words)
adopter, adorers, adorner, atoners, darners, darters, departs, deports, donates, dopants, drapers, eardrop, entraps, errands, errants, nonarts, nondate, notepad, operand, operant, ornater, panders, panters, pardons, parents, parrots, partner, patrons, pedants, pendant, persona, petards, ponders, portend, porters, postern, praetor, praters, presort, pretans, pronate, pronest, prorate, protean, ranters, raptors, readopt, readorn, reports, reroast, respond, restrap, retards, retraps, roasted, roaster, rodents, seaport, senator, snorted, snorter, spanned, spanner, sparred, sported, stander, starred, tanners, tendons, traders, treason, trepans