The word natrolites 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: 12
Highest Scoring Words With Friends™ Play In The Letters natrolites
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Seven Letter Word Alert: (87 words)
aileron, altoist, antlers, antsier, artiest, atoners, attires, elastin, elation, entails, estriol, instate, intorts, iratest, isolate, latents, latites, latrine, leantos, lionets, litters, loaners, loiters, nailers, nailset, nastier, natters, nattier, nitrate, norites, nostril, orients, orleans, otarine, rations, ratline, rattles, rattons, realist, reliant, reloans, renails, rentals, reslant, restain, retails, retains, retilts, retinal, retinas, retinol, retints, retoast, retotal, rotates, salient, saltern, saltier, sealion, senator, slatier, slitter, snotter, stainer, starlet, starlit, startle, station, sternal, stilter, stonier, straint, striate, tailors, talents, tastier, tertial, tilters, tinters, toaster, toenail, toilers, toilets, transit, treason, trenail, triones