The word transferase 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 transferase
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Seven Letter Word Alert: (41 words)
aerates, arrests, earners, earnest, eastern, ensears, erasers, errants, fastens, fatness, ferrets, festers, fraters, narrate, nearest, nesters, rafters, ranters, rasters, refrets, renests, renters, rerents, reseats, resents, resters, retears, sateens, searats, seastar, seaters, senates, sensate, serrate, snarers, starers, sterane, sterner, tearers, teasers, terrane