The word keratoscope 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (56 words)
acerose, captors, carpets, cerates, coakers, coaster, cookers, creates, escaper, operate, packers, packets, partook, peckers, pectose, pockets, poorest, precast, precoat, precook, presoak, rackets, recoats, recooks, repaces, repacks, repaste, repeats, rescope, respace, respeak, respect, respoke, restack, restake, restock, restoke, retacks, retakes, retapes, rockets, roseate, scepter, sceptre, scooper, scooter, seaport, speaker, specter, spectra, spectre, stacker, stocker, stooper, tackers, toecaps