The word bullterriers 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: 18
Highest Scoring Words With Friends™ Play In The Letters bullterriers
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Seven Letter Word Alert: (49 words)
bellies, berries, billets, blister, blurrer, blurter, bluster, bristle, bruiser, bullets, bullies, burlers, burlier, bustier, bustler, butlers, leisure, libeler, lustier, rebells, rebills, rebites, rebuilt, reburst, reliers, retells, retiles, retills, retirer, retires, retries, riblets, rillets, rustier, rustler, rutiles, sterile, stiller, stirrer, subtler, subtree, surlier, tellers, tellies, terrier, tillers, trebles, trellis, ureters