The word saprolite 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: 13
Highest Scoring Words With Friends™ Play In The Letters saprolite
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Seven Letter Word Alert: (38 words)
aplites, apostle, estriol, isolate, loiters, opiates, palters, paroles, parties, pastier, patrols, petrols, pilates, pirates, plaster, platers, politer, portals, realist, repilot, replait, replots, resplit, retails, ropiest, saltier, seaport, slatier, soapier, spoiler, stapler, tailors, toilers, toprail, topsail, traipse, triples, tripole