The word phosphorescence 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: 32
Highest Scoring Words With Friends™ Play In The Letters phosphorescence
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Seven Letter Word Alert: (59 words)
censers, censors, cheeses, chooser, chooses, chopper, coerces, coheres, conches, coppers, corpses, creches, echoers, encores, essence, hencoop, honoree, hoppers, necrose, noosers, onshore, openers, operons, opposer, opposes, oppress, peepers, perches, persons, pheeses, ponchos, pooches, poopers, popcorn, porches, poroses, process, propene, propose, rechose, rehones, reopens, reposes, rescope, reshoes, sconces, scooper, screech, screens, scrooch, secerns, shopper, snooper, soccers, sooners, soppers, sphenes, spheres, sponsor