The word economisers 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: 18
Highest Scoring Words With Friends™ Play In The Letters economisers
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Seven Letter Word Alert: (41 words)
censers, censors, cerises, cession, coiners, cosines, crimson, cronies, encores, erosion, incomer, incomes, ionomer, isomere, isomers, meioses, mercies, messier, microns, mincers, miocene, moronic, mossier, necrose, nemesis, noisome, noosers, omicron, oncosis, recoins, remines, screens, secerns, seniors, sermons, siemens, sincere, soirees, someone, somonis, sooners