The word ameliorates 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: 15
Highest Scoring Words With Friends™ Play In The Letters ameliorates
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Seven Letter Word Alert: (77 words)
aerates, aerials, aeriest, amritas, areolae, areolas, areoles, armlets, atomise, atresia, elaters, emirate, emoters, erotise, estriol, etaerio, isolate, isomere, lariats, loamier, loiters, maestro, mailers, malaise, maleate, maltier, maltose, marital, marlite, martial, mealier, meatier, melters, meteors, metrise, mistral, moister, morales, mortals, mortise, motlier, oatmeal, oleates, omelets, realest, realise, realism, realist, reemits, relates, remails, remates, remelts, remotes, resmelt, retails, reteams, retiles, retimes, roseate, roselet, saltier, seamier, seriate, seriema, slatier, smartie, smelter, stealer, steamer, sterile, stromal, tailors, tamales, telomer, toilers, tramels