The word diverticula 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: 21
Highest Scoring Words With Friends™ Play In The Letters diverticula
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Seven Letter Word Alert: (40 words)
activer, aedilic, article, auricle, caviled, caviler, ciliate, citadel, clavier, culvert, curated, curtail, decrial, deliria, deltaic, dialect, dilater, diluter, ductile, ilvaite, livider, radicel, radicle, reaudit, recital, rivaled, rivulet, traduce, trailed, triadic, trivial, uralite, vaulted, vaulter, velaric, verdict, viaduct, victual, virtual, vraiced