The word firefighters 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: 22
Highest Scoring Words With Friends™ Play In The Letters firefighters
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Seven Letter Word Alert: (33 words)
eighter, ferrets, ferries, ferrite, fierier, fifties, fighter, fishier, freight, fresher, frights, grister, hefters, heftier, heifers, refires, refresh, refrets, refries, regrets, rehires, reifier, reifies, reshift, resight, retires, retries, righter, sheriff, shifter, sighter, stiffer, tigrish