The word litterbugs 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™ Play In The Letters litterbugs
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Seven Letter Word Alert: (36 words)
bitters, blister, bluster, bristle, brittle, buglers, bulgier, busgirl, bustier, bustler, butlers, butters, butties, gerbils, giblets, glister, glitter, gluiest, gristle, gustier, gutsier, gutters, litters, lustier, lutites, rebuilt, retilts, riblets, rutiles, slitter, stilter, subtler, tilters, tribute, turtles, ugliest