The word fluorescent 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 fluorescent
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Seven Letter Word Alert: (76 words)
cenotes, censure, centers, centres, cloners, closure, cloture, cluster, colters, confers, confuse, confute, consult, cornets, coulees, coulter, counsel, counter, creoles, elector, elocute, eluents, elutors, enclose, encores, encrust, enforce, estrone, fencers, flenser, florets, flounce, flouter, fluents, fluster, fluters, focuser, forseen, fortune, foulest, fuelers, functor, lectern, lecture, necrose, neuters, octenes, oftener, oneself, ourself, reclone, reclose, recluse, recount, refects, reflect, refocus, refuels, refutes, relents, restful, retunes, roselet, scenter, scouter, sulfone, tenures, toluene, tonsure, treeful, trounce, unclose, unclots, unerect, unreels, unreset