The word agglomerative 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: 25
Highest Scoring Words With Friends™ Play In The Letters agglomerative
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Seven Letter Word Alert: (49 words)
aerogel, agamete, areolae, average, aviator, avigate, elative, emirate, emotive, etaerio, gloater, loamier, maleate, maltier, margate, marital, marlite, martial, mealier, meatier, megaerg, migrate, mileage, motlier, oatmeal, overage, overate, overeat, overlie, overlit, ragtime, reavail, regalia, reimage, removal, taggier, telomer, toggler, travail, variate, variola, vegetal, velaria, veliger, vermeil, vertigo, violate, voltage, vomiter