The word arthroscope 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: 19
Highest Scoring Words With Friends™ Play In The Letters arthroscope
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Seven Letter Word Alert: (85 words)
archers, cahoots, captors, carhops, carpers, carpets, carport, carrots, carters, chapter, charter, chaster, cheapos, chooser, coarser, coaster, cohorts, corpora, crasher, craters, creator, earshot, eparchs, hapters, harpers, hoarser, ootheca, orators, parches, parrots, patches, phraser, poacher, poaches, pooches, poorest, porches, porters, pothers, praetor, praters, precast, precoat, presort, proctor, prorate, raptors, reactor, rechart, recoats, rectors, repatch, reports, reroast, reroots, reshoot, restrap, retraps, rhetors, roaches, roaster, rooster, rooters, scooper, scooter, scraper, seaport, sharper, shooter, shorter, soother, spectra, stooper, strophe, teashop, tephras, toecaps, toparch, torches, torpors, tracers, trasher, trocars, trochar, trooper