The word gastroscopes 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (58 words)
actress, aspects, asserts, assorts, captors, cargoes, carpets, casters, castors, coaster, corpses, corsage, corsets, costars, crosses, escarps, escorts, gaspers, gassers, grasses, grosses, pargets, parsecs, passers, pasters, pastors, poorest, poroses, portage, possets, 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, tossers