The word stammerers 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: 16
Highest Scoring Words With Friends™ Plays In The Letters stammerers
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Seven Letter Word Alert: (27 words)
ammeter, armrest, arrests, erasers, masters, metamer, rammers, rasters, reamers, remates, reseats, restems, resters, reteams, retears, seamers, seaters, serrate, smarter, smearer, stammer, starers, steamer, streams, tearers, teasers, trammer