The word spectroscope 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™ Plays In The Letters spectroscope
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Seven Letter Word Alert: (45 words)
coerces, coppers, corpses, corsets, cresset, escorts, opposer, opposes, oppress, pectose, percept, pesters, poetess, poopers, poorest, poroses, posters, precept, presets, process, propose, reposes, reposts, rescope, resects, respect, respots, resteps, scepter, sceptre, scooper, scooter, secrets, sectors, soccers, soppers, specter, spectre, stepper, steppes, stereos, stooper, stopper, toppers, toprope