The word buttermilks 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: 23
Highest Scoring Words With Friends™ Play In The Letters buttermilks
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Seven Letter Word Alert: (58 words)
betrims, bilkers, bitters, blister, bluster, brisket, bristle, brittle, brutism, bulkier, bustier, bustler, butlers, butters, butties, erbiums, imburse, kilters, kirtles, kittler, kittles, leukism, limbers, litters, lumbers, lustier, lutites, metrist, milkers, misrule, muskier, mustier, mutters, rebuilt, retilts, riblets, rumbles, rutiles, skitter, skittle, slitter, slumber, stilter, stumble, subitem, sublime, subtler, sulkier, terbium, tilters, timbers, timbrel, timbres, tribute, tublike, tumbler, tumbles, turtles