The word backscatters 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™ Play In The Letters backscatters
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Seven Letter Word Alert: (42 words)
abasers, abaters, abrases, abreact, abreast, acaters, actress, attacks, backers, baskets, basters, batters, bracket, breasts, cabaret, carcass, caskets, casters, cracket, rackets, rebacks, recasts, restack, retacks, retasks, saccate, sackers, scarabs, scatter, searats, seastar, setback, skaters, stacker, staters, stratas, streaks, tackers, taskbar, taskers, tasters, teacart