The word streambeds 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 streambeds
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Seven Letter Word Alert: (52 words)
ambered, basters, beaters, bedares, bedmate, bedress, bedrest, beermat, berated, berates, besmear, brassed, breasts, dearest, debaser, debases, debater, debates, demasts, demates, deserts, dessert, embased, embases, embread, masters, readmes, reasted, rebased, rebases, rebated, rebates, redates, remated, remates, reseats, restems, reteams, sabered, seabeds, seamers, seaters, sedater, sedates, smarted, smeared, steamed, steamer, streams, tasered, teasers, tressed