The word stereoscope 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: 17
Highest Scoring Words With Friends™ Play In The Letters stereoscope
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Seven Letter Word Alert: (31 words)
corpses, corsets, cresset, escorts, pectose, pesters, poetess, poorest, poroses, posters, presets, process, reposes, reposts, rescope, resects, respect, respots, resteps, scepter, sceptre, scooper, scooter, secrete, secrets, sectors, specter, spectre, steeper, stereos, stooper