The word rhombohedral 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: 24
Highest Scoring Words With Friends™ Play In The Letters rhombohedral
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Seven Letter Word Alert: (25 words)
arbored, armhole, armored, barroom, bedroom, bloomed, bloomer, boarder, boredom, broader, brooder, broomed, drooler, earldom, earmold, hoarder, labored, laborer, malodor, marbled, marbler, rambled, rambler, rebloom, reboard