The word efflorescent 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: 23
Highest Scoring Words With Friends™ Play In The Letters efflorescent
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Seven Letter Word Alert: (47 words)
cenotes, centers, centres, cloners, coffees, coffers, coffles, colters, confers, cornets, creoles, effects, efforts, elector, enclose, encores, enforce, entrees, estrone, feelers, fencers, fleecer, fleeces, fleeter, flenser, florets, foresee, forseen, lectern, necrose, octenes, offence, offense, oftener, oneself, reclone, reclose, reelect, refects, refence, reflect, relents, roselet, scenter, scoffer, secrete, toffees