The word extinguisher 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: 25
Highest Scoring Words With Friends™ Plays In The Letters extinguisher
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Seven Letter Word Alert: (52 words)
eighter, ensuite, enthuse, entries, exigent, exiting, gesture, greisen, gunters, gushier, gustier, gutsier, hirsute, hungers, hunters, hurting, husting, igniter, ignites, inherit, insight, integer, neither, neuters, nightie, nutsier, regents, rehinge, reshine, resight, resting, retunes, reunite, reusing, rushing, rusting, shinier, shunter, sighter, sixteen, stinger, suiting, tenures, therein, tiering, tigrish, treeing, trienes, uniters, unities, unreset, uterine