The word thunderers 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: 15
Highest Scoring Words With Friends™ Plays In The Letters thunderers
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Seven Letter Word Alert: (33 words)
denture, detuner, detunes, druther, endures, ensured, ensurer, enthuse, herders, hunters, hurters, neuters, nutseed, renders, renters, rerents, retuned, retunes, returns, shunted, shunter, sterned, sterner, tenders, tenured, tenures, thunder, turners, undrest, unreset, ureters, ushered, usherer