The word gastroscope 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
Seven Letter Word Alert: (49 words)
actress, aspects, captors, cargoes, carpets, casters, castors, coaster, corpses, corsage, corsets, costars, escarps, escorts, gaspers, pargets, parsecs, pasters, pastors, poorest, poroses, portage, postage, posters, potages, precast, precoat, process, recasts, recoats, repasts, reposts, respots, scapose, scooper, scooter, scrapes, scrooge, seaport, sectors, soapers, spacers, sparest, spectra, stagers, stooges, stooper, storage, toecaps