The word kaolinites 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: 16
Highest Scoring Words With Friends™ Play In The Letters kaolinites
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Seven Letter Word Alert: (29 words)
anklets, antlike, elastin, elation, elision, entails, inkiest, inosite, intakes, iolites, isolate, kainite, kaoline, kaolins, leantos, liaison, lionets, lionise, nailset, oatlike, oiliest, oilskin, salient, sealion, sinlike, sonlike, talkies, tinkles, toenail