The word ameliorative 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: 20
Highest Scoring Words With Friends™ Play In The Letters ameliorative
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Seven Letter Word Alert: (39 words)
airmail, airtime, areolae, aviator, elative, emirate, emotive, etaerio, ilvaite, limiter, loamier, maleate, maltier, marital, marlite, martial, mealier, meatier, militar, motlier, oatmeal, overate, overeat, overlie, overlit, ravioli, reavail, removal, telomer, travail, trivial, variate, variola, veilier, velaria, vermeil, violate, vitriol, vomiter