The word fluorescence 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: 24
Highest Scoring Words With Friends™ Play In The Letters fluorescence
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Seven Letter Word Alert: (36 words)
censure, cloners, closure, coerces, concurs, confers, confuse, coulees, counsel, creoles, enclose, encores, enforce, feelers, fencers, fleecer, fleeces, flenser, flounce, focuser, foresee, forseen, fuelers, necrose, occluse, oneself, ourself, reclone, reclose, recluse, refence, refocus, refuels, sulfone, unclose, unreels