The word polymerases 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 polymerases
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Seven Letter Word Alert: (53 words)
amperes, areoles, armless, asperse, earless, elapses, elopers, employs, empress, essayer, lamprey, lassoer, leapers, leasers, leprosy, mapless, maypole, measles, morales, morsels, mossery, oarless, ospreys, parleys, paroles, parsley, pessary, players, pleaser, pleases, polymer, presale, rayless, relapse, repeals, replays, reposes, resales, reseals, resoles, sampler, samples, sealers, seamers, serapes, slayers, slopers, soapers, sparely, splayer, yealmer, yelmers, yelpers