The word kimberlites 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: 22
Highest Scoring Words With Friends™ Play In The Letters kimberlites
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Seven Letter Word Alert: (43 words)
bemires, beslime, betimes, betrims, bilkers, bitsier, blister, brisket, bristle, elitism, itemise, kestrel, kilters, kirtles, limbers, limiter, melters, metrise, milkers, milkier, mislike, mistier, rebites, reemits, remelts, resmelt, retiles, retimes, riblets, riblike, risible, silkier, siltier, skelter, slimier, smelter, smilier, sterile, timbers, timbrel, timbres, trebles, tremble